73 lines
1.1 KiB
Markdown
73 lines
1.1 KiB
Markdown
## PURE BASH
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### Getting the terminal size (*in a script*).
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This is handy when writing scripts in pure bash and `stty`/`tput` can’t be
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called.
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```shell
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get_term_size() {
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# Usage: get_term_size
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# (:;:) is a micro sleep to ensure the variables are
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# exported immediately.
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shopt -s checkwinsize; (:;:)
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printf '%s\n' "$LINES $COLUMNS"
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}
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```
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### Convert a hex color to RGB
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```shell
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hex_to_rgb() {
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# Usage: hex_to_rgb "#FFFFFF"
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((r=16#${1:1:2}))
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((g=16#${1:3:2}))
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((b=16#${1:5:6}))
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printf '%s\n' "$r $g $b"
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}
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```
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### Convert an RGB color to hex.
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```shell
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rgb_to_hex() {
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# Usage: rgb_to_hex "r" "g" "b"
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printf '#%02x%02x%02x\n' "$1" "$2" "$3"
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}
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```
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### `printf` as a `date` replacement.
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Bash’s `printf` has a built-in method of getting the date which we can use
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in place of the `date` command in a lot of cases.
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**NOTE:** Requires bash4+
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```shell
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date() {
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# Usage: date "format"
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# See: 'man strftime' for format.
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printf "%($1)T\\n"
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}
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```
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### `dirname`
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Extract the directory from a file path.
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```shell
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dirname() {
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# Usage: dirname "path"
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printf ‘%s\n’ "${1%/*}/"
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}
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```
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