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How to use the exec command in a shell script?
File Descriptors and Logging in Shell Scripts Using the exec Command The exec command is a powerful tool for manipulating file-descriptors (FD), creating output and error logging within scripts with a minimal change.
What happens if if else is true in shell script?
If the “if-else “condition is “true” then the first group of statements will execute. If the condition is “false” then the second group of statements will execute. As per the above flow, the interpreter will execute the “if condition”.
How to dynamically build a command in Bash?
Dynamically building a command in bash Ask Question Asked11 years, 8 months ago Active11 years, 8 months ago Viewed19k times 20 2 I am construcing a command in bash dynamically. This works fine: COMMAND=”java myclass” ${COMMAND} Now I want to dynamically construct a command that redirectes the output:
How to check PID of shell using exec?
Let’s run an experiment to understand it better: We checked the PID of the current shell using echo $$ and pstree commands and then executed a sleep of 300 seconds using exec. Let’s now switch to a different terminal to check the process list: As we can see, PID 79, which was initially assigned to Bash, is now assigned to the sleep command.
How to execute find exec multiple commands in Linux?
PATH Provide the path and locations where you wish to execute find exec grep OPTIONS Check man page of find command to get the list of all supported options with find COMMAND provide the command which you wish to combine with find -exec command ; Execute command; true if 0 status is returned.
Can a shell function be executed in a shell?
Not directly, no. Find is executing in a separate process, not in your shell. Create a shell script that does the same job as your function and find can -exec that. Get the output of find in the current script file and iterate over the output as you may want.
Do you need find-Exec to spawn a shell?
A function is local to a shell, so you’d need find -exec to spawn a shell and have that function defined in that shell before being able to use it. Something like: bash allows one to export functions via the environment with export -f, so you can do (in bash):