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add more info about BASH options

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Jacob Chapman 2022-05-14 16:08:29 -05:00 committed by GitHub
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@ -3255,9 +3255,25 @@ dd if=/dev/zero of=//dev/shm/200m bs=1M count=200
watch -n 1 wc -l filename watch -n 1 wc -l filename
``` ```
##### Un/Safely pipeline
```bash
# These options can make your code safer but, depending on how your pipeline is written, it might be too aggressive
# or it might not catch the errors that you are interested in
# for reference see https://gist.github.com/mohanpedala/1e2ff5661761d3abd0385e8223e16425
# and https://mywiki.wooledge.org/BashPitfalls#set_-euo_pipefail
set -o errexit # exit immediately if a pipeline returns a non-zero status
set -o errtrace # trap ERR from shell functions, command substitutions, and commands from subshell
set -o nounset # treat unset variables as an error
set -o pipefail # pipe will exit with last non-zero status, if applicable
set -Eue -o pipefail # shorthand for above (pipefail has no short option)
```
##### Print commands and their arguments when execute (e.g. echo `expr 10 + 20 `) ##### Print commands and their arguments when execute (e.g. echo `expr 10 + 20 `)
```bash ```bash
set -x; echo `expr 10 + 20 ` set -x; echo `expr 10 + 20 `
set -o xtrace; echo `expr 10 + 20 ` # this might be easier to remember
``` ```
##### Print some meaningful sentences to you (install fortune first) ##### Print some meaningful sentences to you (install fortune first)