bash check if directory is empty

The OP simply wanted to test if the directory was empty or not. fi. Is there a resource anywhere that lists every spell and the classes that can use them? A little Google search revealed some methods: Using dir and find commands, does not work on non-english Windows versions: www.computing.net; Using dir command with /a-d, does not work for folders: www.computing.net; Using dir and findstr commands, does not work on non-english Windows versions: windowsitpro.com It only works with a 1-element array of an empty string, not 2 elements. Please help Thanks. \; Lets see how we can check whether a directory is empty or not in bash scripting. Fastest find solution I can think of goes like. I guess I didn't test that comment before posting. Draw horizontal line vertically centralized. This is an anonymous edit of my answer that might or might not be helpful to somebody: fi Empty. You can test the exit status of a program or command just by running it. Conclusion. what if the directory has files but each file is of 0 size? find $DIR -type f -exec echo $DIR is empty \; PS I did find for my ancillary problem (may contain subdirectories but no files) this solution: else echo ” files found” Also, a nit in my original suggestion: adjust the ls command so you don’t get unwanted output: site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. Also, since any bash test without an argument will always return true, it is advisable to quote the variables so that the test will have at least an (empty) argument, irrespective of whether the variable is set or not. Nixcraft’s if: if [ “$(ls -A $DIR)” ] if [ -e $i ] && [ $(echo $?) someone please say me why this dont work. to check if a directory does not exists on Unix: [ ! 2. verifies whether or not content exists It returns 3 when directory is empty, it should be 2 as empty directory has only . Applied to the question this gives: This takes advantage of the fact that test builtin exits with 2 if given more than one argument after -e: First, "$1"/* glob is expanded by bash. You can use if..else.fi in a shell script: Here is another example using bash for loop to check for any *.c files in the ~/projects/ directory: From the Linux and Unix bash(1) man page: Seems to me that using ls is not required – in fact, it is doable within the shell alone: set - `echo . Create a new bash file, named, and enter the script below. The delete command will delete entire directories whether they are empty or not! How reliable is a system backup created with the dd command? MacBook in bed: M1 Air vs. M1 Pro with fans disabled, Editing colors in Blender for vibrance and saturation, Quantum harmonic oscillator, zero-point energy, and the quantum number n, The proofs of limit laws and derivative rules appear to tacitly assume that the limit exists in the first place. line=`head -$i ./testdir2.txt | tail -1` Not a good idea. Since you pipe it to another program, it's redundant. > bash directory_remove.sh directory-name The -d option in the if clause is used to test for the directory existence in the shell script. What is the term for diagonal bars which are making rectangular frame more rigid? sane OS/FS. The first one will check whether a file exists regardless of the type, while the second one will return true only if the FILE is a regular file (not a directory or a device). @Michael: Crap, you're right. Well, I'm just learning bash and I thought that it could be a faster way rather than iterate through all the directory, but CPUs are powerful and you are right, not secure. I need to check if $1 or $2 are empty before continuing but I don't know if bash has any logic of the sort. It should be. Your email address will not be published. Yesterday I needed a Dos batch script to check if folder is empty. else Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Solution with “$(ls -A $DIR)” could exceed command buffer size. My bash script: if [ "$(ls -A /mnt/mamdrive/"As An empty directory contains no files nor subdirectories. I even checked older bash and it's still wrong there; like you say set -x shows how it expands. find /path/to/dir -type d -empty … Bash Script Delete empty Directories #!/bin/bash #Check if user input parameter, if not ask to enter directory if [ x"$1" = "x" ]; then #Ask user to input directory where to start search for empty directories. The test && then 1 || or 2 is a standard way to condense a conditional statement of the form If find's output is empty, you'll return false: This will do the job in the current working directory (. I believe you should be using $correctdirname for the reason above even though the script works for me–I don’t know if it will work generically given the difference. How to use unlimited list of arguments to a command in bash shell? 1. If the file is empty, then the job script should finish EOJ. There are many ways to find out if a directory is empty or not under Linux and Unix bash shell. Remember, to display a complete list of options, use either df ––help or du ––help . A Linux operating system; Access to a terminal window / command line (Ctrl-Alt-T / Ctrl-Alt-F2) Note: You may encounter the term bash script. but no methods I have tried worked. You're right, @TrueY, I've incorporated it in the answer. uid=`id -u $USER`,gid=`id -g $USER` Common $HOME/Desktop/Common \; Check if folder /data/ is empty or not using bash only features From the Linux and Unix bash(1) man page : nullglob If set, bash allows patterns which match no files to expand to a null string, rather than themselves. fi The above code will return "The File is empty" even if the file does not exist. Starting with a path to some directory, determine whether the directory is empty. # a ‘1’ would mean the directory is empty. Sample outputs: However, the simplest and most effective way is to use ls command with -A option: How to check if a directory is empty? Yes. Thanks! return-code (test value of $?) ls $DIR/* Effectively, this will return true for every case except where the string contains no characters. test=$correctdirname” “$correctdirname”*” While creating a bash script, it is commonly helpful to test if file exists before attempting to perform some action with it.. Bash/Shell: Check if directory exists (empty or not empty) There are no shell attributes as I have used in all other examples and scenarios in this tutorial. As the file exists in the directory, so the output will be True. What does it mean when an aircraft is statically stable but dynamically unstable? Required fields are marked *, {{#message}}{{{message}}}{{/message}}{{^message}}Your submission failed. In order to check if a directory exists in Bash, you have to use the “-d” option and specify the directory name to be checked. ).-f FILE - True if the FILE exists and is a regular file (not a directory or device).-G FILE - True if the FILE exists … Likewise, to verify if a directory exists using Bash you can use a very similar test expression: [ -d dirname ] As explained for the expression to verify if a file exists, also in this case the expression below can be used together with an if else statement. There are more files than number of allowed arguments--I guess this could C supports three ways to check existence of a file on disk. if [ ! Write a shell script to create a directory “Shell2” Create 10 text files “a5_1.txt” “a5_10.txt” using loop inside the directory “Shell2.” Give access privilege for those text files , read only for others and group , read and write for owner.. echo $Dir is empty fi. See the man page test(1). creates a list of directories within the current directory that match a pattern”. Failures include getting and setting permissions, as well as other problems. Edit: I replaced -1a with -1A (see @Daniel comment). `find . The below script will check if the file exists and the file is empty or not. This work for me, to check & process files in directory ../IN, considering script is in ../Script directory: I might have missed an equivalent to this, which works on Unix. But I landed here after a period passed programming in php and what I was actually searching was a check like the empty function in php working in a bash shell. A)Create a text file “Pros_and_Cons_of_C.txt” in “C_programming” directory I am trying to write a script for my first class, part of it to check is if a directory is empty or not.. else (Note the ‘\’ command continuation character in the find command.). -eq “0 ” ], then find "/dir2" type d -empty -exec command1 -arg1 {} \; I am trying to pass a directory path as a parameter to my bash script (which tests whether its empty), but the directory name contains spaces. -d directory/path to a directory ] ; then # things to do when not an existing directory Note: Be careful, leave empty spaces on … Check to see if a variable is empty or not. fi. if … – in this case the grep returns all directories that are 5 numerical digits if [ “$files” == “$test” ] http://bash.cyberciti.biz/guide/Main_Page. It returns a list of all the files and sub directories in the given path. check_empty.sh and execute with our without command line arguments: $ bash check_empty.sh Empty Variable 1 Empty Variable 3 Empty Variable 5 Furthermore, the execution of the above script with a command line argument will trigger opposite results: $ bash check_empty.sh hello Not Empty Variable 2 Not Empty Variable 4 Not empty Variable 5 do But, to check if $1 and $2 exist is the same as check if $2 exist, as it can't exist if $1 doesn't. ls $DIR/* > /dev/null You can use the find command to list only files. if [ $# = "2" ] ; then expand, so Shell falls back to trying file named *, which returns os.listdir(path='.') Is it my fitness level or my single-speed bicycle? echo “Take action $DIR is not Empty” Using Bash, there are a number of ways to test if a directory is empty. $ [ "$(ls -A /tmp)" ] && echo "Not Empty" || echo "Empty" This is a standard exercise in all books/blogs/manuals about shells: in bash [ "$(ls -A /path/to/directory)" ] && echo "Not Empty" || echo "Empty" Bash does not have a standard test for a directory being empty, like [ -f file ], so we have to write it. ... How to Check if a File or Directory Exists in Bash, The test command ( [ here) has a "not" logical operator which is the exclamation point (similar to many other languages). Learn More{{/message}}, {{#message}}{{{message}}}{{/message}}{{^message}}It appears your submission was successful. “$(ls -A $line)” ]. if [ [ -d "$DIRECTORY" ]] then echo "$DIRECTORY exists on your filesystem." How to check if a directory exists in Linux. You may be thinking of. With Bash and Dash, you can check for an empty directory using just the shell (ignore dotfiles to keep things simple): set * if [ -e "$1" ] then echo 'not empty' else echo 'empty' fi However I If there is one file, test -e "dir/file" is run, which returns 0. It returns a list of all the files and sub directories in the given path. I think that this solution works fine with gnu find, after a quick look at the implementation. 3. grep ‘[0-9]\{5\}’ ./testdir.txt > testdir2.txt Note I added the final line to remove the 2nd test/data file. I know the "1" might be removed too. If rmdir succeeds, and you actually wanted the empty directory to survive the test, just mkdir it again. creates a list of directories within $1 that match a pattern” fi. #Create a directory $ mkdir testdir #Usual way to check if a directory is empty or not $ [ -z $(ls testdir/) ] && echo "empty" || echo "NOT" empty #Lets create a file in testdir $ touch testdir/file1 #Oh, it works, great echo The Directory is NOT EMPTY. * *` # a ’1′ would mean the directory is empty, if [ “$(ls -A $DIR)” ]; then I’d forgotten: when no matches are found (“*”) then the resulting text is the character unchanged. Here is the updated script with the old vars and if commented out: # files=`echo $correctdirname $correctdirname*` This can be done using the -n or -z string comparison operators.. Check if File Exists and Not Empty. -depth -type d -empty` would work a little better.. pgrep agreppina will work, but ps x | grep agreppina | grep -v grep will not). I used, Oh no! This page shows how to check if a file is empty in Bash shell running on a Linux or Unix-like operating systems. if [ ! One can check if a directory exists in a Linux shell script using the following syntax: [ -d "/path/dir/" ] && echo "Directory /path/dir/ exists." # if [ “$files” == “$test” ] If this part of the code is on a performance critical path, then it might be worth it (or not, needs testing). 1. os.listdir (path='.') Using Bash, there are a number of ways to test if a directory is empty. Method: Why wouldn’t this work? modifying /etc/fstab ): if [ ! I just want to check if the directory doesnt exist, create one else do nothing (not even a message telling me that the directory exists). Why is "I can't get any satisfaction" a double-negative too, according to Steven Pinker? Check if a Folder is Empty in PowerShell. Check whether a directory is empty or not using find command. The find command detects an empty mountpoint directory. You can use ! -f /folder/* ]; then @codeforester, the solution needs to know what are current shell opts. While creating a bash script, it is commonly helpful to test if file exists before attempting to perform some action with it.. exit 0. done. above, ie. I hope that asker is able to adapt this for his own purposes, I had trouble getting this method to work when the /path/to/dir contained spaces and needed to be quoted. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. (Getting ls to give an error code in this case requires a slight change in syntax.). To subscribe to this RSS feed, copy and paste this URL into your RSS reader. else Thanks @Daniel, I edited my answer after your suggestion. http://bash.cyberciti.biz/guide/Main_Page, How to: Detect Duplicate IP Address With arping command under Linux, How to: Measure the Lateceny and Throughput of Apache / Lighttpd / IIS Webserver, 30 Cool Open Source Software I Discovered in 2013, 30 Handy Bash Shell Aliases For Linux / Unix / Mac OS X, Top 32 Nmap Command Examples For Linux Sys/Network Admins, 25 PHP Security Best Practices For Linux Sys Admins, 30 Linux System Monitoring Tools Every SysAdmin Should Know, Linux: 25 Iptables Netfilter Firewall Examples For New SysAdmins, Top 20 OpenSSH Server Best Security Practices, Top 25 Nginx Web Server Best Security Practices. # format ./##### If they are empty, delete them. This results in one argument per file. Fortunately, somebody has built and offered to all a great resource to learn, which is also a cooperative work: Here is my short script that I have a comment and a potential method. those are may be primary level questions , but i can’t understand for answer those questions. : empty dir "nec sit terris ultima Thule" - how should terris be interpreted? Use of if -s Operator. find -type d -empty. This can be done like so: if [ ! -d FILE - True if the FILE exists and is a directory.-e FILE - True if the FILE exists and is a file, regardless of type (node, directory, socket, etc. #!/bin/bash set -eE # stop execution upon error function is_empty() { find $1 -mindepth 1 -exec false {} + -fprintf /dev/stderr "%H is not empty\n" -quit } trap 'echo FAILED' ERR #trap "echo DONE" EXIT # create a sandbox to play in d=$(mktemp -d) f=$d/blah # this will be a potention file set -v # turn on debugging # dir should be empty is_empty $d # create a file in the dir touch $f ! Bash scripting: test for empty directory, if find /some/dir -mindepth 1 | read; then echo "dir not empty" else echo "dir empty " fi at a directory entry via "-maxdepth 0" and test if it is empty with "-empty". 1. creates a list of directories within $1 that match a pattern on /home/$USER/Desktop/Common (mountpoint) with full permissions. I am fairly certain that rc.local can be used, mount -t vboxsf -o \ It is not working for me. A slight variation on the original post which does it numerically and includes dot files. $ find "/tmp" -type f -exec echo Found file {} \; You should now understand how to use df and du commands to check disk space on your Linux system. Check if directory exists in bash script. Check if directory DOES NOT exist in BASH I am running this in a crontab file and I dont want any output telling me that the directory exists. Super User is a question and answer site for computer enthusiasts and power users. Check if File Empty or Not This script will check if given file is empty or not. My if original: if [ “$files” == “$test” ] I am running a C shell script. Comment: As far as I can tell, this version, the find command version, and ls -A, will not detect a directory that contains subdirectories but is void of files. This reads the folder for any files or subfolders, this does mean that it will scan all files in the folder (which may be slow if there are thousands of files), but it does not scan through all the subfolders, if a single subfolder is found, empty or not, that is taken as a signal that the parent folder is not empty. check if a directory is empty or not in shell script; loop through files in a directory in shell script; replace last n characters of a string in shell script; check if a file is empty in shell script; keyboard shortcuts for moving cursor on command line; Read from file in shell script; create symbolic link in linux… I have an output file from a previous step and I need to run "something" in the next step to check if the file is empty. So one would need code to set opts and revert if needed (or figure out opts and count according to them). | wc -l with ls -1A | wc -l if you need to run it on a different target folder. src=”/Users/xxxx/scripts/dirtest” echo this is a dir: $dir I'm working on Ubuntu 18.04.5 LTS. That must be it, no need for parsing ls output, just see if it is empty or not. check if a directory is empty or not in shell script; loop through files in a directory in shell script; replace last n characters of a string in shell script; check if a file is empty in shell script; keyboard shortcuts for moving cursor on command line; Read from file in shell script; create symbolic link … #!/bin/bash if [ -s aFile ]; then echo "The File has some data." Below is a working method to mount Common (sharename) in front of it so I could easily swap if statements. I need to check if a folder is empty or not and according to the output I need to run some other commands. enclose the directory name parameter in double quotes. Prerequisites. correctdirname=”./”$line fi. best way is to do as below: rm ./testdir.txt, while [ $i -le `wc -l ./testdir2.txt | gawk ‘{print $1}’` ]; do You can use the find command (see your local find man page for exact syntax) as follows: find "/path/to/dir" -type f -exec echo Found file {} \; OR. so if the variable contains some value i want to do some job and if the variable doesnt contain any value then i need to skip that job. os.listdir() method of os module is used to get the list of all the files and directories in the specified directory. -mindepth skips the directory itself, -maxdepth prevents recursively defending into subdirectories to speed things up. This was a quick look at how to do checks on directories in linux with bash. If you want to know if there are (no) files to process, use a glob and be prepared to deal with a non-existent file name such as *. I will explain them one by one. Bash check if file is empty or whitespace. echo -n “Dir “$i” “$correctdirname, files=`echo $correctdirname $correctdirname*` if [ -d “$dir” ]; then To learn more, see our tips on writing great answers. The basic syntax is as follows: find /dir/name -type -f -exec command {} \; OR GNU/BSD find command syntax: find /path/to/dir -maxdepth 0 -empty -exec echo {} is empty. Also I didn’t remove testdir2.txt, created by the script in the current directory. \; OR. echo “empty directory $dir_full_path” fi Should work. Upon further inspection I realized my if statement, while it works in my bash, is using the wrong variable. 2. OR However, still there are various ways to check if a file exists or not. No need for counting anything or shell globs. If the Common directory is not empty, it does not run the mount command. # List Empty Directories that are directories in the Or there is actually file with an empty name--I'm not sure it's possible on any Even though the server responded OK, it is possible the submission was not processed. In this guide, learn how to use a bash command to check if a file or directory exists. In this chapter of bash beginner series, you'll learn about using if-else, nested if else and case statements in bash scripts. If so, I will skip some processing. or echo “$DIR is empty” find $HOME/Desktop/Common -maxdepth 0 -type d -empty -exec sudo \ : not empty This is why I don’t post often. Any suggestions? "$ (ls -A )" ] Delete empty directories. Syntax: os.listdir(path) Parameters: path (optional): path of the directory fi. If you wanted to find out whither a particular file exists you could do the following: #!/bin/bash if [ -e ~/files/x.txt ];then echo "Found file" else echo "Did not find file" fi ): or the same command split on three lines just to be more readable: Just replace ls -1A . What's the earliest treatment of a post-apocalypse, with historical social structures, and remnant AI tech? For GNU find, this should work: This solution is using only shell built-ins: This is all great stuff - just made it into a script so I can check for empty directories below the current one. If there is no output, directory is empty. Using find just feels like an overkill to me. One of those ways is to use ls -A to list all files, including those starting with . This is simple: pgrep something && somecommand pgrep is like ps | grep something | grep -v grep, terser but with less options to control output.However, you don't have to worry that you filter out by chance something that actually is needed (e.g. Ceramic resonator changes and maintains frequency when touched. "$(ls -A )" ] Check out our article on how to use fsck command to run a filesystem check as preventive maintenance or when there is an issue with your system. \; find /path/to/dir -type d -empty -exec command1 arg1 {} \; hi, i want to check whether a a variable contains some value or is empty in a shell script. echo “$DIR is not empty”

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