How check grep exit status?
EXIT STATUS The exit status is 0 if selected lines are found, and 1 if not found. If an error occurred the exit status is 2. (Note: POSIX error handling code should check for ‘2’ or greater.)
How can I prevent grep from showing up in PS results?
By putting the brackets around the letter and quotes around the string you search for the regex, which says, “Find the character ‘f’ followed by ‘nord’.” But since you put the brackets in the pattern ‘f’ is now followed by ‘]’, so grep won’t show up in the results list.
How do you end a bash file?
To end a shell script and set its exit status, use the exit command. Give exit the exit status that your script should have. If it has no explicit status, it will exit with the status of the last command run.
What is the exit status for grep in Bash?
The code 1 is because of no lines matching from the input. EXIT STATUS Normally the exit status is 0 if a line is selected, 1 if no lines were selected, and 2 if an error occurred. The exit code is 1 because nothing was matched by grep. EXIT STATUS The exit status is 0 if selected lines are found, and 1 if not found.
What is the exit status for grep in POSIX?
The exit code is 1 because nothing was matched by grep. EXIT STATUS The exit status is 0 if selected lines are found, and 1 if not found. If an error occurred the exit status is 2. (Note: POSIX error handling code should check for ‘2’ or greater.)
Why is the exit code 1 in grep?
So what you are seeing is the count of the match and not to be confused with the exit code of the grep match. The code 1 is because of no lines matching from the input. EXIT STATUS Normally the exit status is 0 if a line is selected, 1 if no lines were selected, and 2 if an error occurred.
When to use grep with uncorrelated output?
This approach is useful in situations where the output of the command and its return code (a.k.a. exit status) are uncorrelated. But, for grep, they are highly correlated: If it produced output, it succeeded. If it didn’t produce output, it failed.