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This is a job for the test command, that allows to check if file exists and what type is it. As only the check is done – the test command sets the exit code to 0 (TRUE) or 1 (FALSE), whenever the test succeeded or not. Also the test command has a logical “not” operator which allows to get the TRUE answer when it needs to test if file does not exist. Sometimes, we need to check if the pattern presents in a file and take some actions depending on the result. It can be done with the help of ‘exit status codes’. Each Linux command returns a status when it terminates normally or abnormally You can use command exit status in the shell script to display. May 18, 2010 Although there are already a lot of good security features built into Linux-based systems, one very important potential vulnerability can exist when local access is granted – – that is file permission based issues resulting from a user not assigning the correct permissions to files and directories. So based upon the need for proper permissions. Apr 20, 2012 H ow do I test existence of a text file in bash running under Unix like operating systems? You need to use the test command to check file types and compare values. The same command can be used to see if a file exist of not. The syntax is as follows.
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ow do I check if a file is empty or not using bash or ksh shell script under a UNIX / Linux / macOS / OS X / BSD family of operating systems? How do I check if a file is empty in Bash?Linux Sdm.dmg Does Not Exist Mean
You can use the find command and other options as follows. The -s option to the test builtin check to see if FILE exists and has a size greater than zero. It returns true and false values to indicate that file is empty or has some data. This page shows how to check if a file is empty in Bash shell running on a Linux or Unix-like operating systems.
Check If File Is Empty Or Not Using Shell Script
The syntax is as follows:
Sample outputs:
Now create another file with some data in it:
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You should not see any output from the find command.
Bash Script – Check If File is Empty or Not With the -s Option
However, one can pass the -s option as follows in script or shell prompt:
Sample outputs:
The non zero output indicate that file is empty.
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Sample outputs:
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The zero output indicate that file is not empty. So you can write a shell script as follows.
Shell Script To Check If File Is Empty OR Not
Run it as follows:chmod +x script.sh
./script.sh /etc/resolv.conf
Sample outputs:
Run it on an empty file:touch /tmp/test.txt
./script.sh /tmp/test.txt
Sample outputs:
Conclusion
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This page showed how to check if file is empty on a Linux or Unix-like operating systems using various commands. See test command for more info.
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