if [[ "$s1" == "$s2" ]] - moinudin 4 我必须使用这个答案来将一个变量与一个固定字符串进行比较。 - Wok 21 双等号在第一个案例中是一个错误。Bash允许它,但是可移植的变体应该是 if [ "$s1" = "$s2" ]。另请参见Rahul的答案。 - tripleee 4 你好,我想知道为什么这里有空格会出问题 -...
This script shows a simple example of anifstatement that uses anelseclause. The conditional test checks whether the customer's age is greater or equal to 21. If it is, the customer can enter the premises, and thethenclause is executed. If they're not old enough, theelseclause is execute...
关于if语句:bash脚本if -eqbashequalsif-statement Bash script if -eqbash脚本的新手,我需要检查Group中的第一个单词是否等于Users中的第二个单词。 1234567891011 Group=`echo $rules | egrep -v 'Test'` Users=`echo $rules | grep -i 'Test' | awk '{print substr($0, index($0,$2))}'` if [ ...
例子 ./cidr-to-ip.sh [OPTION(only one)] [STRING/FILENAME] -h 显示此帮助屏幕 -f 在给...
if [[ ]]; then fi Exp: if[[$USER='username']];thenecho"true"elseecho"false"fi not equal:!= numeric equality:-eq not equals:-ne is empty:-z if[[1-eq1]];if[[-z$USER]]; Elif if[[-z$USER]];thenecho"user is empty"elif[[1-eq1]];thenecho"1==1"elseecho"false"fi ...
Python，perl，C++ bash:脚本解释器 编程能力： 脚本编程 变量：内存空间，命名的内存空间（可以...
if [[ $USER = 'username' ]]; then echo "true" else echo "false" fi 1. 2. 3. 4. 5. not equal:!= numeric equality:-eq not equals:-ne is empty:-z if [[ 1 -eq 1 ]]; if [[ -z $USER ]]; 1. 2. 3. Elif if [[ -z $USER ]]; then ...
First, we put “if” and we use the square brackets. Then, inside these square brackets, we write the condition that reads “if [221] equals [221].” Here, we essentially utilize the “-eq,” flag which denotes or performs the equals sign’s operation. We add the terminating “;” ...
If the statement is true, the code is executed. if statements in bash script use square brackets for the logical condition and also have support for else and elif (else if) branches. Bash supports standard programming language conditional operators such as equals (==), not equals (!=), ...
Using ;;& in place of ;; causes the shell to test the next pattern list in the statement, if any, and execute any associated list on a successful match. The exit status is zero if no pattern matches. Otherwise, it is the exit status of the last command executed in list....