Shell script: A summary of several basic string processing methods

Today summarizes several ways to handle strings in the shell script, encapsulating several basic string-handling functions.

The code (STRING.INC) is as follows:

#!/bin/sh# a test function # input: No function str_testfunc () {    echo  "This is a test function"} #获取字符串长度 # Input: String function str_length () {    echo  ' expr length $1 '} #获取字符串子串 # Input: string   Intercept Start position # Input: string   intercept start position   intercept length function str_substring () {    if [  $# -eq 2 ]; then        len= ' str_length $1 '         echo  ' expr substr $1 $2  $len '      elif [ $# -eq 3 ]; then         echo  ' expr substr $1 $2 $3 '     else         ECHO    FI} #替换子串 # Input: string   to replace substring   string function for substitution  str_replace () {    echo ${1//$2/$3}} #按给定字符截取字符串 # Input: string   character function for dividing substrings  str_split () {    i=1    while [ true ]; do         temp= ' echo  '  | cut -d  ' $  -f$i '          if [  "$temp"  !=  " ]; then              ((i++))              echo  $temp         else             break        fi     done} #删除字符串前后空格 # Input: String Function str_trim () {    echo  ' echo  "'} #找出给定子串在字符串中出现的位置 # Input: string   substring to search function str_indexof () {    echo  ' expr  Index $1 $2 '} #将字符串中字符全部转换为大写 # Input: String Function str_toupper () {    echo $ ( Echo $1 | tr  ' [A-z] '   ' [A-z] ')} #将字符串中字符全部转换为小写 # Input: String function str_tolower () {     echo $ (echo $1 | tr  ' [A-z] '   ' [A-z] ')}

#!/bin/sh. ./string.incstr_testfunc# Get string length echo  string "abcdefgh" Length: ' str_length  "abcdefgh" ' "| END "#获取字符串子串echo   string" abcdefgh "intercept substring: ' str_substring " abcdefgh " 4 3 '" | END "echo  string" abcdefgh "intercept substring: ' str_substring " abcdefgh " 4 '" | END "#替换字符串echo   replace BCD in ABCDEBCDF with F: ' str_replace " ABCDEBCDF " " BCD   "x" ' "| END "#截取字符串echo   intercept string 1: ' str_split  ' a b c d e f g '   '   ' ' | END "echo  intercept string 2: ' str_split " A:b:c:d:e:f:g " ": "" | END "#去掉前后空格echo  "     ab cd     "remove front and back spaces: ' str_trim "    ab cd   "'" | END "BCDE first occurrence in ECHO ABCDEFG: ' str_indexof " ABCBCBD " " BCB "'" | END "#字符串中字母大小写转换echo   ABCDEFGH" to capitalize: ' str_toupper  "abcdefgh" ' "| END "echo " abcdefgh "Turn lowercase: ' str_tolower " abcdefgh "'" | END "Exit 0 

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Shell script: A summary of several basic string processing methods