The tr command
translate or delete characters 6 examples from the lessons of the IVski Linux Playground — try them in the terminal next to them.
Options in the examples
-d, --delete- delete characters in ARRAY1, do not translate
-s, --squeeze-repeats- replace each sequence of a repeated character that is listed in the last specified ARRAY, with a single occurrence of that character
Examples
echo 'hello' | tr 'a-z' 'A-Z'Lowercase to uppercase
echo 'Hello World' | tr ' ' '_'Replace spaces with _
echo 'hello' | tr -d 'l'Delete all 'l' chars
cat file.txt | tr -s ' 'Squeeze multiple spaces
cut -d, -f1 data.csv | tr 'a-z' 'A-Z'df / | awk 'NR == 2 {print $5}' | tr -d %8: just the number