Bash's ${var:offset:length} and ${var//pattern/replacement} let you do most string operations without ever spawning sed. Faster, and the syntax is portable across modern shells.
Bash
s="hello-world-foo-bar"
# Substring (offset, length)
echo "${s:6}" # world-foo-bar
echo "${s:6:5}" # world
# Find & replace
echo "${s/-/_}" # hello_world-foo-bar (first occurrence)
echo "${s//-/_}" # hello_world_foo_bar (all occurrences)
echo "${s/#hello/HI}" # HI-world-foo-bar (only if prefix)
echo "${s/%bar/BAZ}" # hello-world-foo-BAZ (only if suffix)
# Strip prefix / suffix
file="path/to/config.json"
echo "${file##*/}" # config.json (everything after last /)
echo "${file%/*}" # path/to (everything before last /)
echo "${file##*.}" # json (extension)
echo "${file%.*}" # path/to/config (sans extension)Save your own code snippets
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