Table of Contents

• Running sed
• Command-Line Options
• sed scripts
• Addresses: selecting lines

Running sed

hello

sed 's/hello/world/' input.txt > output.txt
cat output.txt

world

Following lines are equivalent to above:

sed 's/hello/world/' input.txt > output.txt
sed 's/hello/world/' < input.txt > output.txt
cat input.txt | sed 's/hello/world/' - > output.txt

sed -i 's/hello/world/' file.txt
sed -n '45p' file.txt

-i

in-place

-n

suppress all lines

'45p'

print line45

Following lines are all equivalent:

sed 's/hello/world/' input.txt > output.txt

sed -e 's/hello/world/' input.txt > output.txt
sed --expression='s/hello/world/' input.txt > output.txt

echo 's/hello/world/' > myscript.sed
sed -f myscript.sed input.txt > output.txt
sed --file=myscript.sed input.txt > output.txt

Command-Line Options

See /sed/cli

sed scripts

• See /sed/scripts

<e sed commands follow this syntax:

[addr]X[options]

• Commands within a script or script-file can be separated by semicolons (;)

sed '30,35d' input.txt > output.txt

• 30, 35 is [addr], which means lines from 30 to 35.
• d is the delete command

sed '/^foo/q42' input.txt > output.txt

• /^foo/ is a regular expression address.
• q is the quit command
• 42 is the command option (exit code)

See /sed/commands

Addresses: selecting lines