shell中$和$@的区别

解析Shell脚本中参数处理

最新推荐文章于 2025-09-17 19:39:24 发布

最新推荐文章于 2025-09-17 19:39:24 发布 · 179 阅读

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本文详细解析了Shell脚本中如何处理参数输入，包括单个参数、多个参数及参数列表的不同处理方式，以及参数在不同上下文中的输出表现。

E_BADARGS=65
 
if [ ! -n "$1" ]
then
  echo "Usage: `basename $0` argument1 argument2 etc."
  exit $E_BADARGS
fi
echo
index=1
 
for arg in "$*"
do
  echo "Arg #$index = $arg"
  let "index+=1"
done
echo "Entire arg list as single word."
echo
index=1
 
for arg in "$@"
do
  echo "Arg #$index = $arg"
  let "index+=1"
done
echo "Entire arg list as seperated words."
echo
index=1
 
for arg in $*
do
  echo "Arg #$index = $arg"
  let "index+=1"
done
echo "Entire arg list as seperated words."
echo
index=1
 
for arg in $@
do
  echo "Arg #$index = $arg"
  let "index+=1"
done
echo "Entire arg list as seperated words."
exit 0

执行结果：

$ ./test.sh bi yutong

Arg #1 = bi yutong
Entire arg list as single word.

Arg #1 = bi
Arg #2 = yutong
Entire arg list as seperated words.

Arg #1 = bi
Arg #2 = yutong
Entire arg list as seperated words.

Arg #1 = bi
Arg #2 = yutong
Entire arg list as seperated words