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代码： 全选

 if ["$1"=="hello"]; then
          echo "Hello,how are you?"
elif ["$1"==" "]; then
          echo "You must input parameters, ex> $0 someword"
else
          echo "The only parameter is 'hello'"
fi

代码： 全选

cloudy@cloudy-laptop:~/scripts$ cat sh08.sh
#!/bin/bash - 
#===============================================================================
#
#          FILE:  sh08.sh
# 
#         USAGE:  ./sh08.sh 
# 
#   DESCRIPTION:  Show "Hello" from $1....
# 
#       OPTIONS:  ---
#  REQUIREMENTS:  ---
#          BUGS:  ---
#         NOTES:  ---
#        AUTHOR:   (), cloudy
#       COMPANY:  
#       VERSION:  1.0
#       CREATED:  10/22/2009 08:47:25 PM CST
#      REVISION:  ---
#===============================================================================
if ["$1"=="hello"]; then
          echo "Hello,how are you?"
elif ["$1"==" "]; then
          echo "You must input parameters, ex> $0 someword"
else
          echo "The only parameter is 'hello'"
fi
set -o nounset                              # Treat unset variables as an error


cloudy@cloudy-laptop:~/scripts$ ./sh08.sh hello
./sh08.sh: line 20: [hello==hello]: command not found
./sh08.sh: line 22: [hello== ]: command not found
The only parameter is 'hello'
cloudy@cloudy-laptop:~/scripts$