strindex.sh (raw) (856B)
1 #!/bin/sh 2 # strindex (string index) 3 # description: finds the starting index of substring ($1) in a string ($2) 4 # e.g.$ strindex "cat" "the cat sat on the mat" #returns 4 5 # 6 # NOTES: index returned ranges from 0 - (string length) 7 8 if [ "$1" = "-h" ] || [ "$1" = "--help" ]; then 9 echo "Usage: strindex [OPTIONS] SUBSTRING STRING" 10 echo "" 11 echo "print the starting index of SUBSTRING in STRING" 12 echo "-1 will be printed if SUBSTRING could not be found" 13 echo "" 14 echo "OPTIONS (must be provided before SUBSTRING STRING)" 15 echo " -r reverse provided SUBSTRING and STRING order" 16 exit 17 fi 18 19 if [[ "$1" = "-r" ]]; then # swap arguments (e.g. strindex "cat on mat" "mat") 20 shift 21 x="${1%%$2*}" 22 [[ "$x" = "$1" ]] && echo "-1" || echo "${#x}" 23 else #standard usage (see e.g.$) 24 x="${2%%$1*}" 25 [[ "$x" = "$2" ]] && echo "-1" || echo "${#x}" 26 fi 27