Shell script

Aside from 🤮, I need to write Shell script in several place.

This is a note for me.

test

file

• -e: exists
• -f: exists & regular # "regular" means both text and binary. In other words excluding directory, symlink and device
• -d: exists & directory
• -r: exists & the user has read permission
• -w: exists & the user has write permission
• -x: exists & executable
• -N: exists & modified from last read
• -s: exists & non empty

string

• -n: non empty
• -z: empty

set

• -: Enable

• +: Disable

• -e: exit with non 0

• -u: exit with undefined variable

• -x: print executed command

• -o: # TODO

• pipefail: # TODO

assign value and print to tty

> dir="$(mktemp --directory | tee --append /dev/tty)"
/tmp/tmp.y2NaKkqILD
> echo $dir
/tmp/tmp.y2NaKkqILD