Case statement for Bash Script Programming

The case statement is used to simplify complex if statements.

#!/bin/bashwhile true; do  read -p "Enter your score:" score  if [ "$score" == "quit" ]; then          exit 0  elif [ $score -lt 60 ]; then          echo "stupid"          break  elif [[ $score -ge 60 && $score -lt 70 ]]; then          echo "C"          break  elif [[ $score -ge 70 && $score -lt 80 ]]; then          echo "B"          break  elif [[ $score -ge 80 && $score -lt 90 ]]; then          echo "A"          break  elif [ $score -ge 90 ]; then          echo "A+"          break  else           continue    fidone

Syntax format of the case statement:

case expression inpattern1)    suite1    ;;pattern2)    suite2    ;;...patternn)    suiten    ;;*)    other_suiten    ;;esac

Pattern in case:

A | B: A or B

*: Any character of any length

? : Any single character

[]: Specified range

Use the case statement to rewrite the above Code:

#!/bin/bashwhile true; do  read -p "Enter your score:" score  case $score in  [1-5][0-9])          echo "stupid"          ;;  6[0-9])          echo "C"          ;;  7[0-9])          echo "B"          ;;  8[0-9])          echo "A"          ;;  9[0-9])          echo "A+"          ;;  100)          echo "excelent"          ;;  quit)          exit 0          ;;  *)          continue          ;;  esacdone

This article from the "Tiger, tiger, shengwei" blog, please be sure to keep this source http://tobeone.blog.51cto.com/817917/1550314

Case statement for Bash Script Programming