sed.md

sed

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sed 's/find/replace/g'         # Find & replace.
sed '/filter/s/find/replace/'  # Find & replace in lines matching filter.

sed '/find/d'        # Delete line.
sed '1d;2d'          # Delete first and second lines.
sed '3d'             # Delete third line.
sed '$d'             # Delete last line.
sed '/<!--/,/-->/d'  # Delete lines from/to regexs.

sed '/find/y/abc/ABC/'  # Find & translate.

sed 's/^/replace/'  # Prepend to file.
sed '\$atext'       # Append to file.

Find & replace in place

sed -i 's/find/replace/g' -i file
sed -i '' -e 's/find/replace/g' file           # If error with previous command on Mac.
sed -i '.original' -e 's/find/replace/g' file  # Creates a backup "file.original". /!\ No space between -i and ''.

Find & replace in multiple files

find . -type f -name "*.py" -exec sed -i "s/find/replace/g" {} \;
grep -rl "list files containing this" . | xargs sed -i "" -e "s/find/replace/g"

Multiple commands

sed -e 'cmd1' -e 'cmd2' -i file
sed 'cmd1,cmd2' file

Replace from-to

sed -i '/from_pattern/, /to_pattern/ s/find/replace/' file
sed -i '/VARNAME = {/, /^}/ s/^/# /' file  # Example: Commenting a dictionary defined on several lines.

Insert a block of text in a file

Source: https://www.baeldung.com/linux/file-insert-multiple-lines

Inline

sed -i '/from_pattern/anew line 1\nnew line 2' file

From a file

sed -i '/from_pattern/r new_content_file' file

From STDIN

cat << EOF | sed -i '/from_pattern/r /dev/stdin' file
new line 1
new line 2
EOF

Replace a block of text with the content of a file

Source: https://stackoverflow.com/a/2700594/101831

sed -i '' -ne '/BEGIN_PATTERN/ {' -e 'p; r replace_file.txt' -e ':a; n; /END_PATTERN/ {p; b}; ba' -e '}; p' file