treewide: replace `which` with `command -v`

Fix shellcheck SC2230
> which is non-standard. Use builtin 'command -v' instead.

Using `command -v` is POSIX compliant while `which` is not.  Also to
mention, `command -v` is a shell builtin whereas `which` is a separate
busybox applet.

Once applied to everything concerning OpenWrt we can disable the busybox
feature `which` and save 3.8kB.

Acked-by: Stijn Tintel <stijn@linux-ipv6.be>
Signed-off-by: Paul Spooren <mail@aparcar.org>
[also replace cases in zram-swap]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

1 files changed, 3 insertions, 3 deletions

diff --git a/package/system/zram-swap/files/zram.init b/package/system/zram-swap/files/zram.init
index a6126e578f..42c084855a 100755
--- a/package/system/zram-swap/files/zram.init
+++ b/package/system/zram-swap/files/zram.init
@@ -35,17 +35,17 @@ zram_applicable()
 		return 1
 	}
 
-	which mkswap >/dev/null || {
+	command -v mkswap >/dev/null || {
 		logger -s -t zram_applicable -p daemon.err "[ERROR] 'mkswap' not installed"
 		return 1
 	}
 
-	which swapon >/dev/null || {
+	command -v swapon >/dev/null || {
 		logger -s -t zram_applicable -p daemon.err "[ERROR] 'swapon' not installed"
 		return 1
 	}
 
-	which swapoff >/dev/null || {
+	command -v swapoff >/dev/null || {
 		logger -s -t zram_applicable -p daemon.err "[ERROR] 'swapoff' not installed"
 		return 1
 	}