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authorMasahiro Yamada <yamada.masahiro@socionext.com>2019-10-08 21:05:52 +0900
committerMasahiro Yamada <yamada.masahiro@socionext.com>2019-11-11 20:10:01 +0900
commit9a066357184485784f782719093ff804d05b85db (patch)
tree848b852c2fec4c2a648b3cdbb49ab391341541af /kernel/gen_kheaders.sh
parent39808e451fdf30d20099a92e5185a0acb028d826 (diff)
downloadlinux-9a066357184485784f782719093ff804d05b85db.tar.bz2
kheaders: remove unneeded 'cat' command piped to 'head' / 'tail'
The 'head' and 'tail' commands can take a file path directly. So, you do not need to run 'cat'. cat kernel/kheaders.md5 | head -1 ... is equivalent to: head -1 kernel/kheaders.md5 and the latter saves forking one process. While I was here, I replaced 'head -1' with 'head -n 1'. I also replaced '==' with '=' since we do not have a good reason to use the bashism. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Diffstat (limited to 'kernel/gen_kheaders.sh')
-rwxr-xr-xkernel/gen_kheaders.sh8
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/gen_kheaders.sh b/kernel/gen_kheaders.sh
index 5a0fc0b0403a..b8054b0d5010 100755
--- a/kernel/gen_kheaders.sh
+++ b/kernel/gen_kheaders.sh
@@ -41,10 +41,10 @@ obj_files_md5="$(find $dir_list -name "*.h" |
this_file_md5="$(ls -l $sfile | md5sum | cut -d ' ' -f1)"
if [ -f $tarfile ]; then tarfile_md5="$(md5sum $tarfile | cut -d ' ' -f1)"; fi
if [ -f kernel/kheaders.md5 ] &&
- [ "$(cat kernel/kheaders.md5|head -1)" == "$src_files_md5" ] &&
- [ "$(cat kernel/kheaders.md5|head -2|tail -1)" == "$obj_files_md5" ] &&
- [ "$(cat kernel/kheaders.md5|head -3|tail -1)" == "$this_file_md5" ] &&
- [ "$(cat kernel/kheaders.md5|tail -1)" == "$tarfile_md5" ]; then
+ [ "$(head -n 1 kernel/kheaders.md5)" = "$src_files_md5" ] &&
+ [ "$(head -n 2 kernel/kheaders.md5 | tail -n 1)" = "$obj_files_md5" ] &&
+ [ "$(head -n 3 kernel/kheaders.md5 | tail -n 1)" = "$this_file_md5" ] &&
+ [ "$(tail -n 1 kernel/kheaders.md5)" = "$tarfile_md5" ]; then
exit
fi