From 6135aff27cedcf81ff863715685808829364f7cb Mon Sep 17 00:00:00 2001
From: kxxt <rsworktech@outlook.com>
Date: Mon, 26 Sep 2022 21:56:08 +0800
Subject: [PATCH] simplify

---
 src/etc/cat-and-grep.sh | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/src/etc/cat-and-grep.sh b/src/etc/cat-and-grep.sh
index 08de25a7778..238f7f5b660 100755
--- a/src/etc/cat-and-grep.sh
+++ b/src/etc/cat-and-grep.sh
@@ -51,10 +51,7 @@ while getopts ':vieh' OPTION; do
     esac
 done
 
-# an utility function to check if a string contains a substring
-stringContain() { [ -z "$1" ] || { [ -z "${2##*$1*}" ] && [ -n "$2" ];};}
-
-if ! stringContain 'E' "$GREPFLAGS"
+if ! echo "$GREPFLAGS" | grep -q E
 then
     # use F flag if there is not an E flag
     GREPFLAGS="F$GREPFLAGS"