Let’s take a look at the code that is used to check if the directory of the folder exists in our system or not. For that, we will be using a purely new folder. Therefore, within the terminal shell query area, we have tried the “mkdir” command to create a new directory named “...
In case you want to check if more than one file exists, you can still do so. Similar to the above situations, use “-f” and test if a file you’re trying to locate is still there. Separate the files by using the “&&” operator. For example, you want to test if 1 file 1 an...
Check If Directory Exists In order to check if a directory exists in Bash, you have to use the “-d” option and specify the directory name to be checked. if [[ -d "$DIRECTORY" ]] then echo "$DIRECTORY exists on your filesystem." fi As an example, let’s say that you want to...
# input check: if [ -z "$1" ] ; then error "ERROR: you must specify a file, use -h for help" fi filen="$1" # rename any .1 , .2 etc file: for n in 9 8 7 6 5 4 3 2 1; do if [ -f "$filen.$n" ]; then p=`expr $n + 1` echo "mv $filen.$n $filen...
if [ -r "$rpmpackage" ];then echo "=== $rpmpackage ===" rpm -qi -p $rpmpackage else echo "ERROR: cannot read file $rpmpackage" fi done 这里出现了第二个特殊的变量$*,该变量包含了所有输入的命令行参 数值。如果您运行showrpm openssh.rpm...
Sometimes, we need to check if a path is a directory or something else in the Bash Script. We will develop a very basic Ubuntu script that will enable us to provide the information, whether it's a filename or perhaps a folder. Make sure to log in from yo
if ...; then ... elif ...; then ... else ... fi 大多数情况下,可以使用测试命令来对条件进行测试。比如可以比较字符串、判断文件是否存在及是否可读等等… 通常用" [ ] "来表示条件测试。注意这里的空格很重要。要确保方括号的空格。 [ -f ...
check if folder not exist if [ ! -d "$PROJECTNAME" ] then printf "\n Repo $PROJECTNAME folder does not exist..\n" else printf "\n Repo $PROJECTNAME folder already exist..\n" fi Array Create array # method 1 declare -a FontColor=() #method 2 FontColor[0]='yellow' FontColor[...
For example, if we need to move all .bash files into the script folder and then give them execute permissions, our script would look like this:#!/bin/bash for FILE in $HOME/*.bash; do mv "$FILE" "${HOME}/scripts" chmod +x "${HOME}/scripts/${FILE}" done...
If you are working on Ubuntu, you have seven virtual terminals available to you. The desktop environment takes place in the seventh virtual terminal, so you can return to a friendly GUI using theCtrl-Alt-F7keybinding. You can open the shell using theCtrl-Alt-F1keybinding. After that, the...