'Else if'in bash scripting, often written as'elif', is used to check multiple conditions in your code. It is used with the syntax,if [firstStatement]; then... elif [secondCondition]; then... else. It’s a powerful tool that allows your scripts to make decisions based on various scen...
syntax error near unexpected token then 同理,还有很多出错信息 比如 syntax error near unexpected token fi 等都是这样引起的. 5 if 后面一定要跟上 then. 同理 elif 后面一定要跟上 then. 不然提示出错信息: syntax error near unexpected token else top BASH IF http://lhsblog01.blog.163.com/blog/s...
清单9. 用 if、then、else 计算表达式 [ian@pinguino ~]$ function mycalc () > { > local x > if [ $# -lt 1 ]; then > echo "This function evaluates arithmetic for you if you give it some" > elif (( $* )); then > let x="$*" > echo "$* = $x" > else > echo "$* = ...
if 判断条件; then statement1 statement2 ... fi 2 双分支的if语句: if 判断条件; then statement1 statement2 ... else statement3 statement4 ... fi 3 多分支的if语句: if 判断条件1; then statement1 ... elif 判断条件2; then statement2 ... elif 判断条件3; then statement3 ... else sta...
if [ ! -z err−o!−eapk ]; then 会报出-e无法找到的错误; 而if [ ! -z err]||[!−eapk ]; then 没问题; 整数比较 : -eq 等于,如:if [ "a"−eq"b" ] -ne 不等于,如:if [ "a"−ne"b" ] -gt 大于,如:if [ "a"−gt"b" ] ...
The syntax of the if statement in Bash is: if first-test-commands; then consequent-commands; [elif more-test-commands; then more-consequents;] [else alternate-consequents;] fi Tests commands in the bash if statement, and bash elif clauses, are executed in order until one test succeed....
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if 先来个实例： x=5; if [ $x = 5 ]; then echo 'x equals 5.'; else echo...
if [ -z "$1" ]; then echo '(4) -z "$1":' "Quote : empty." fi } empty_string "$1" 这个脚本使用test命令的-n、-z操作符来判断传入脚本的第一个参数是否为空字符串,并对比加双引号和不加双引号把变量值括起来的测试结果。 具体执行结果如下: ...
if [[ $REPLY =~ ^[Yy]$ ]]; then git checkout $TARGET else echo "Still on original branch" fi fi } 建议大家体验一下,十分优雅~ 修改命令行提示符 在~/.bash_profile 或者 ~/.bashrc 设置命令行提示符。 PS1='\033[0;32m\] \[\033[0m\] \w $ ' ...