# bash nested if/else if [ $choice -eq 1 ] ; then echo "You have chosen word: Bash" else if [ $choice -eq 2 ] ; then echo "You have chosen word: Scripting" else if [ $choice -eq 3 ] ; then echo "You have chosen
test -f /etc/fstab ## true if a regular file test -h /etc/rc.local ## true if a symbolic link [ -x "$HOME/bin/hw" ] ## true if you can execute the file [[ -s $HOME/bin/hw ]] ## true if the file exists and is not empty 整数测试 整数之间的比较使用-eq、-ne、-gt...
mount ${Disk}1 $MntDIR1 mount ${Disk}2 $MntDIR2 } #Flush () #{ # dmsetup status # dmsetup remove_all #} ###INSTALL GRUB### INGRUB () { echo -e "\033[32m###install grub###\033[0m" grub-install --root-directory=$(dirname $MntDIR1) $Disk # ([ $? -eq 0 ]&&echo ...
Catkin tools installed successfully."fi}create_catkin_ws(){# Checkifworkspace existsif[ -e"$CATKIN_DIR/.catkin_workspace"] || [ -d"$CATKIN_DIR/.catkin_tools"]; thenecho"Catkin workspace detected at ~/catkin_ws"elseecho"Creating catkin workspace ...
cd /net || { echo "Can't read /net. Make sure you've logged in to the Samba network, and try again."; exit 1; } do_stuff more_stuff 注意,在{号和 echo 之间需要有一个空格,同时}之前要加上分号。 顺便提一下,如果你要在脚本里频繁改变当前目录,可以看看 pushd/popd/dirs 等命令,可能你...
If the script is interrupted (killed), I want to make sure the whole cache is invalidated.And then, add this new helper logic into the remote_copy function (lines 52-81):52 function remote_copy { 53 local server=$1 54 check_previous_run $server 55 test $? -eq 0 && echo "INFO: ...
1 dir=/home/bozo 2 3 if cd "$dir" 2>/dev/null; then # "2>/dev/null" hides error message. 4 echo "Now in $dir." 5 else 6 echo "Can't change to $dir." 7 fiif命令将返回if后边的命令的退出码.与此相似,当在一个在使用与或列表结构的时候,test或中括号的使用,也并不一定非的...
问使用/bin/bash -c安装pod崩溃EN曾几何时,我们将自己的应用运行在Kubernetes上,每当出现容器异常崩溃时,我们往往都是一边重启容器,一边面对崩溃的容器无从下手。通常在业务研发自己build的镜像内包含了shell,我们还能通过在command中嵌入一个["sleep", "3600"]命令来阻塞容器内服务启动,不过也有时候会出现不...
-ne 不等于,如:if [ "a"−ne"b" ] -gt 大于,如:if [ "a"−gt"b" ] -ge 大于等于,如:if [ "a"−ge"b" ] -lt 小于,如:if [ "a"−lt"b" ] -le 小于等于,如:if [ "a"−le"b" ] < 小于(需要双括号),如:(("a"<"b")) ...
问BASH脚本-测试年龄和压缩文件EN编程语言: 编译器,解释器 编程语言:机器语言,汇编语言、高级语言 静态语言:编译型语言 强类型(变量) 关键字: 事先转换成可执行格式 c,c++,JAVA,C# 动态语言:解释型语言 on the fly 弱类型 边解释变执行 php,shell,python,perl(面向过程) ...