if[[$USER_INPUT-lt10||$USER_INPUT-ge100]];then echo"Your entry is NOT two digits" fi In this example the logicalORoperator combines two conditions and only one of them or both can be true for the condition to be overall true and the code to execute. We also demonstrate the-geoperat...
we have been using the “-z” operator to check whether the variable is empty or not. For this, we have started the code with the initialization of an empty variable “v”. The “if-not” operator condition is checking whether the variable “v” is empty or not using the “-z...
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" ] -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...
check-scripts:# Fail if any of these files have warningsshellcheck myscripts/*.sh or in a Travis CI.travis.ymlfile: script:# Fail if any of these files have warnings-shellcheckmyscripts/*.sh Services and platforms that have ShellCheck pre-installed and ready to use: Travis CI Codacy Code ...
7. Bash 中的 if ## FORMAT if [ condition ]; then cmd elif [ condition ]; then cmd else cmd fi ## EXAMPLE if [ -e file1 ] # file1 exists if [ -f file1 ] # file1 exists and is a regular file if [ -s file1 ] # file1 exists and size > 0 if [ -L file1 ] # fil...
Another common error is using the wrong operator in the condition. For example, using ‘=’ instead of ‘-eq’ for numerical comparison can lead to unexpected results. a=5b=5# Incorrect syntaxif[$a=$b];thenecho'a is equal to b'fi# Output:# a is equal to b ...
Theifstatement is closed with afi(reverse of if). Pay attention to white space! There must be a space between the opening and closing brackets and the condition you write. Otherwise, the shell will complain of error. There must be space before and after the conditional operator (=, ==, ...
if [[ "$x" == *"$s"* ]] Theifcondition is always false; why? if条件总是假的;为什么? 5 个解决方案 #1 3 Try this:http://tldp.org/LDP/abs/html/comparison-ops.html 试试这个:http://tldp.org/LDP/abs/html/comparison-ops.html ...
# commands to run if the command fails fi Here, the!is placed before a command or condition. If the command or condition returns a failure (non-zero exit status), the!negates it and makes theifcondition true. The!operator is typically used with commands or test expressions to perform a...
7 # Same as else if 8 then 9 command4 10 command5 11 else 12 default-command 13 fi使用if test condition-true这种形式和if[condition-true]这种形式是等价的.向我们前边所说的"["是test的标记.并且以"]"结束.在if/test中并不应该这么严厉,但是新版本的Bash需要...