seq.md

seq

Coreutils: https://www.gnu.org/software/coreutils/manual/html_node/seq-invocation.html

Print range to stdout:

[ "$(seq 3)" = "$(printf '1\n2\n3\n')" ] || exit 1
[ "$(seq 2 4)" = "$(printf '2\n3\n4\n')" ] || exit 1
[ "$(seq 1 2 7)" = "$(printf '1\n3\n5\n7\n')" ] || exit 1

Options:

• s: separator. Default: ' '

Usage in loops

seq is a good possibility for loops:

seq 3 | while read i; do
    echo "$i"
done

Alternatives

Bash brace expansion:

for i in {1..10}; do echo $i; done

but this is less efficient for longer ranges as it will expand huge command on the command line.