常用命令

date

获取当前时间

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time=$(date "+%Y%m%d")

语法

例一：字符串拆分&&循环

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#!/bin/bash
 
string="hello,shell,split,test"
array=(${string//,/ })  
 
for var in ${array[@]}
do
   echo $var
done

例二：自定义assert

高级shell编程笔记(第二十九章 调试)_bash assert-CSDN博客

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#!/bin/bash
#
assert()
{
    E_PARAM_ERR=98
    E_ASSERT_FAILED=99
    
    if [ -z "$2" ];then
      return $E_PARAM_ERR
    fi
    
    lineno=$2
    
    if [ ! $1 ];then
      echo "Assertion failed: \"$1\""
      echo "File \"$0\", line $lineno"
      exit $E_ASSERT_FAILED
    fi
}

a=5
b=4
condition="$a -lt $b"

assert "$condition" $LINENO
#脚本以下的代码只有当"assert"成功时才会继续执行

#...
echo "This statement echoes only if the \"assert\" does not fail."
#...
exit 0

例三：条件判断

Linux Bash Shell编程（八）：条件判断与示例_linux条件判断式 提交中-CSDN博客

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if [ -z $1 ];then # -z为空返回真
    echo $1"aaa"
else
    echo $1"bbb"
fi

# 两个条件表达式进行操作
if [ "x$1" == "xall" ] || [ "x$1" == "x$repoName" ];then

例四：case 语法

shell中的case语句详解_shell case-CSDN博客

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case $1 in
    push)
    	echo $1
        ;;
    stash)
        echo $1
        ;;
    *)
        echo "error"
esac