String
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s1=string
s2='string'
s3="string"
echo "s1: \"${s1}\": ${#s1}"
echo "s2: \"${s2}\": ${#s2}"
echo "s3: \"${s2}\": ${#s3}"
s="abcdefabc"
ss=${s/abc/hello}
echo ${ss}
ss=${s//abc/hello}
echo ${ss}
ss=${s/#abc/hello}
echo ${ss}
ss=${s/%abc/hello}
echo ${ss}
Bash
INFO