In a shell script, how can I find out if a string is contained within another string. In bash, I would just use =~, but I am not sure how I can do the same in /bin/sh. Is it possible?
You can use a case statement:
case "$myvar" in
*string*) echo yes ;;
* ) echo no ;;
esac
All you have to do is substitute string
for whatever you need.
For example:
case "HELLOHELLOHELLO" in
*HELLO* ) echo "Greetings!" ;;
esac
Or, to put it another way:
string="HELLOHELLOHELLO"
word="HELLO"
case "$string" in
*$word*) echo "Match!" ;;
* ) echo "No match" ;;
esac
Of course, you must be aware that $word
should not contain magic glob characters unless you intend glob matching.
You can define a function
matches() {
input="$1"
pattern="$2"
echo "$input" | grep -q "$pattern"
}
to get regular expression matching. Note: usage is
if matches input pattern; then
(without the [ ]
).
You can try lookup 'his' in 'This is a test'
TEST="This is a test"
if [ "$TEST" != "${TEST/his/}" ]
then
echo "$TEST"
fi
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