Shell script argv、argc 使用範例

Shell script 常會需要接收參數, 就會用到 argc、argv, 來寫個簡單範例.

• argc: 參數共有幾個
• argv: 取得各個參數

Shell script argv、argc 使用範例

Shell 裡面的 argc、argv 對應的變數如下:

• argc: $#
• argv: $@ (變數會存於此陣列), 由 $1, $2, $3 ... 取得各個參數(變數)
• 註: $0 為 path + script name, ex: /tmp/ex.sh

範例1

1. vim ex.sh

   #!/bin/bash
   echo "argc: $#"
   echo "argv 1: $1"
   echo "argv 2: $2"
   echo "argv 3: $3"
   echo "argv @: $@"

2. chmod +x ./ex.sh
3. ./ex.sh a b c

   argc: 3
   argv 1: a
   argv 2: b
   argv 3: c
   argv @: a b c

範例2

#!/bin/bash
if [ $# -ne 0  ]; then
    while [ $# != 0 ]
    do
        echo $1 # 將每個分別印出
        shift
    done
else
    echo "Usage: \"./ex.sh a b c\"";
    exit
fi

fi