sed

Edit text in a scriptable manner. See also: awk, ed. More information: https://www.gnu.org/software/sed/manual/sed.html.

Replace all apple (basic regex) occurrences with mango (basic regex) in all input lines and print the result to stdout:

{{command}} | sed 's/apple/mango/g'

Execute a specific script [f]ile and print the result to stdout:

{{command}} | sed -f {{path/to/script.sed}}

Replace all apple (extended regex) occurrences with APPLE (extended regex) in all input lines and print the result to stdout:

{{command}} | sed -E 's/(apple)/\U\1/g'

Print just a first line to stdout:

{{command}} | sed -n '1p'

Replace all apple (basic regex) occurrences with mango (basic regex) in all input lines and save modifications to a specific file:

sed -i 's/apple/mango/g' {{path/to/file}}