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How to use cut command in bash script?
bash script use cut command at variable and store result at another variable. I’m a beginner, sorry for such a question but I couldn’t find it out myself. for line in cat file will run twice… once with line=cat and once with line=file.
How to get the output of a Bash command?
`pwd` command shows the path of the current working directory. The following script stores the output of `pwd` command into the variable, $current_dir and the value of this variable is printed by using `echo` command. The option and argument are mandatory for some bash commands.
How to read the output of a command?
The other answers will break if output of command contains spaces (which is rather frequent) or glob characters like *, ?, […]. IFS=$’ ‘ on the same line as the read statement: this will only set the environment variable IFS for the read statement only. So it won’t affect the rest of your script at all.
Why do I need to store my Bash output in variables?
Sorry, there is a loong answer, but as bash is a shell, where the main goal is to run other unix commands and react to resut code and/or output, ( commands are often piped filter, etc… ). Storing command output in variables is something basic and fundamental.
How to execute command with sudo and execute script with?
This means that sudo will be executed with echo and the output of whoami (which was executed as your unprivileged user) as arguments. If you want to run whoami inside the command substitution with sudo, you can put it in a script and run the script with sudo, as you’ve done, or you may use an in-line script, as in
How to change the output of a command in Bash?
In addition to backticks `command`, command substitution can be done with $ (command) or “$ (command)”, which I find easier to read, and allows for nesting. Quoting ( “) does matter to preserve multi-line variable values; it is optional on the right-hand side of an assignment, as word splitting is not performed, so OUTPUT=$ (ls -1) would work fine.
How to find the root user of a Sudo script?
However, in case you want to drop root privileges to some of the commands and run them as the actual user who invoked the command with sudo, you can check for the $SUDO_USER variable to figure out the original user. #!/bin/bash # ref: https://askubuntu.com/a/30157/8698 if ! [ $ (id -u) = 0 ]; then echo “The script need to be run as root.”