BASH TEST SUBSTRING
#!/bin/bash
STR='GNU/Linux is an operating system'
SUB='Linux'
if [[ "$STR" == *"$SUB"* ]]; then
echo "It's there."
fi
Wide-eyed Wren
#!/bin/bash
STR='GNU/Linux is an operating system'
SUB='Linux'
if [[ "$STR" == *"$SUB"* ]]; then
echo "It's there."
fi
if echo "$string" | grep 'foo'; then
echo "It's there!"
fi
#!/bin/bash
STR='GNU/Linux is an operating system'
SUB='Linux'
case $STR in
*"$SUB"*)
echo -n "It's there."
;;
esac