nicest: run a command with the highest nice/ionice/oom-adj

README.md

@@ -59,6 +59,7 @@ This repository hosts various small personal tools.
 - [`moversleep`](moversleep): move incoming files from a dir into another
 - [`multiman`](multiman): open your web browser to manual pages from various OSes
 - [`mv-with-thumb`](mv-with-thumb): like mv, but also moves XDG thumbnails
+- [`nicest`](nicest): run a command with the highest nice/ionice/oom-adj
 - [`no-utf8-bom`](no-utf8-bom): just remove pointless UTF-8 BOM from stdin or files
 - [`pass-ls-entries`](pass-ls-entries): list pass(1) entries in find(1) format, not tree(1) format
 - [`password-prompt`](password-prompt): simply prompt a password on tty and then print it

nicest/nicest

@@ -0,0 +1,46 @@
+#!/bin/sh -eu
+# SPDX-License-Identifier: WTFPL
+
+usage () {
+	cat <<- EOF
+		usage: $0 COMMAND [ARGS...]
+		       $0 -p PID
+
+		Run COMMAND ARGS... with lowest priority regarding CPU (nice(1)),
+		I/O (ionice(1)) and OOM-adj (choom(1)).
+		With -p, renice PID instead (and I/O nice and OOM-adj).
+	EOF
+}
+
+if [ "${1-}" = -h ] || [ "${1-}" = --help ]
+then
+	usage
+	exit 0
+elif [ $# -eq 0 ]
+then
+	usage >&2
+	exit 64
+fi
+
+has () {
+	command -v "$1" > /dev/null 2> /dev/null
+}
+
+if [ $1 = -p ]
+then
+	if [ $# -ne 2 ]
+	then
+		usage >&2
+		exit 64
+	fi
+	has renice && renice -n 19 -p $2
+	has choom && choom -n 1000 -p $2
+	has ionice && ionice -c 3 -p $2
+	exit 0
+fi
+
+has choom && set -- choom -n 1000 -- "$@"
+has ionice && set -- ionice -c 3 "$@"
+set -- nice -n 19 "$@"
+
+exec "$@"

nicest/test.sh

@@ -0,0 +1,17 @@
+#!/bin/sh -eu
+
+cd "$(dirname "$0")"
+
+die () {
+	echo "$*" >&2
+	exit 1
+}
+
+./nicest -p $$ > /dev/null
+
+./nicest true
+
+if ./nicest false
+then
+	die "false should have exited with error"
+fi