What happens if you use set E in a bash script?
set -e. If a command fails, set -e will make the whole script exit, instead of just resuming on the next line. If you have commands that can fail without it being an issue, you can append || true or || : to suppress this behavior — for example set -e followed by false || : will not cause your script to terminate.
How do I get rid of set E?
#!/bin/bash set -e # Uncomment next line to see set -e effect: #blubb if blubb; then echo “Command blubb was succesful.” else echo “Command blubb failed. Exit code: $?” fi echo “Script exited normally.” Another approach, which I find fairly straightforward (and applies to other set options in addition to -e ):
What is the set command in Bash?
The set command enables options within a script. At the point in the script where you want the options to take effect, use set -o option-name or, in short form, set -option-abbrev. These two forms are equivalent. #!/bin/bash set -o verbose # Echoes all commands before executing.
What does set-e do in bash script?
What set -e does is that it exits if any of the lines fail. What this does is that it prints each command that is going to be executed with a little plus. …when the script looks like this: And to combine these two gems you simply put set -ex at the top of your bash script.
When does Bash exit at the top of the script?
What this does, at the top of your bash script is that it exits as soon as any line in the bash script fails. If the first line fails you don’t want the second line to execute and you don’t want the third line to execute either.
How to execute bash script line by line?
The same effect is put a read in every line. You don’t need to put a read in everyline, just add a trap like the following into your bash script, it has the effect you want, eg. Works, just tested it with bash v4.2.8 and v3.2.25.
When do you run another command in Bash?
If the first command succeeds, the next will not be executed. If it fails, the next will be executed. ||: Run if preceding command exited with a non-zero exit status. &: Run both commands in paralell, the first in background and second in foreground.