sed&awk.md

AWK Resource

https://github.com/freznicek/awesome-awk

https://github.com/pmitev/to-awk-or-not

Quick Example

sed 's/^\(172\.31\.29\.167[[:space:]]*\)[^[:space:]]*/\1newhostname.com/' /etc/hosts

Matching word boundary

cat > test
cat
catfis
catalog

grep '\bcat\b' test
sed 's/\bcat\b/dog/g' test

Matching between context

sed -n '/###START/,/###END/p' sample.txt

sed -n '/###START/,/###END/{/###START/b;/###END/b;p}' sample.txt

sed -n '1p' sample.txt

sed -n '1,3p' sample.txt
# Insert line below matched line
sed '/###START/a\New Line to Insert' sample.txt
# Insert new line above matched line
sed '/###END/i\New Line to Insert' sample.txt
# Replace the matched string within match context
sed '/###START/,/###END/ {/shyam/d}' sample.txt

Example ORS

awk -v ORS=", " '{ print $2 }' input.txt && echo "This is from echo."
Kotlin, Java, Rust, Python, This is from echo.

Use of BEGIN and END Rules in Awk

https://www.baeldung.com/linux/awk-begin-and-end-rules

https://www.baeldung.com/linux/awk-output-same-line