sed

Examples

sed '1,5/find-me/' input_file.txt

Can create a sed script with:

#!/bin/sed -f

s/find/replace/gp

You can edit something different than your match:

sed -n '/matched-text/s/old-text/new-text/g' input-file.txt

# On any line containing "matched-text", substitute "old-text" for "new-text"

Expression Options

• /g - global
• /p - print affected lines
• /I - case insensitive

CLI Flags

• -f - Reads script from file
• -n - Supress unaffected areas

Special characters

• ' - Hide shell variables
• " - Expand shell variables
• () - Execute a statement
• : - Set a label
• &1 - First match

Search types

• s/ - Substitute pattern
• d/ - Delete pattern
• y/ - Character replacement

Can contain ranges:

• 1,5s - Substitute within the first and fifth lines

Commands

• /c - Change line
• /d - Delete line
• /i - Add line above
• /a - Add line below