bash.md

Bash / Shell

Get just the filename

Source: https://stackoverflow.com/a/12152669

$ echo "App.tsx" | cut -f 1 -d '.'
# returns "App"

• -f select which segment
• -d '.' use . as the delimiter

shebang / hashbang

Source: https://itnext.io/upgrading-bash-on-macos-7138bd1066ba

#!/usr/bin/env bash
echo "Using bash $BASH_VERSION"

Inspect the path and use the first encountered bash executable as the interpreter for the script. Good when the user has overridden the default version. E.g. I updated bash when I got a new MacBook.

Move files

for file in *; do git mv "$file" "${file%.js}.ts"; done;

https://stackoverflow.com/a/1225236

Loop

for i in "${arrayName[@]}"
do
   echo $i
done

or

for i in {1..10}; do echo $i; done

Read file line by line

while IFS= read -r line; do
    echo "$line"
done < filename.txt

Datetime

echo "$(date '+%Y-%m-%dT%H:%M:%S')"