shell 函数

shell 脚本
#!/bin/sh
 
# func2.sh
 
char_name()
 
# char_name
 
# to call: char_name string
 
# check if $1 does indeed contain only characters a-z,A-Z
 
{
 
        # assign the argument across to new variable
 
        _LETTERS_ONLY=$1
 
        _LETTERS_ONLY=`echo $1 | awk '{if($0~/[^a-zA-Z]/) print "1"}'`
 
        if [ "$_LETTERS_ONLY" != "" ]
 
        then    
                # oops errors
 
                return 1
 
        else    
                # contains only chars