/bin/bashn=4if![[$n-eq0]];thenecho"Not equal to 0"fi 输出: Not equal to0
A -ne B: 不等于 not equal to 2.3 字符串测试:A, B A > B A < B A >= B A <= B A == B或A = B:等值比较 A != B: 不等于 -z A: 判断A是否为空;空则为真,不空则假; -n A:判断A是否不空;不空则为真,空则为假; =~ "$A" =~ PATTERN 如果变量A中保存的字符串能被PATTERN...
1、&&表示仅当其前面的命令执行成功（返回值非零）时才继续执行后面的命令，例如第三行中只有 [ "$var1" -ne "$var2" ] 测试结果为真，才执行 echo "$var1 is not equal to $var2"回显。||的作用是当其前面的命令执行失败（返回值为零）时才继续执行后面的命令，例如第6行中，仅当 [ ...
used to force another file to be read, but rshd does not generally invoke the shell with those options or allow them to be specified. If the shell is started with the effective user (group) id not equal to the real user (group) id, and the -p option is not supplied, no startup ...
/bin/basha=10b=20if[ $a -eq $b ]thenecho"$a -eq $b : a is equal to b"elseecho"$a -eq $b: a is not equal to b"fiif[ $a -ne $b ]thenecho"$a -ne $b: a is not equal to b"elseecho"$a -ne $b : a is equal to b"fiif[ $a -gt $b ]thenecho"$a -gt $b...
==: Equal to !=: Not equal to -z: Empty string -n: Non-empty string 3. File and Directory Checks: -e: Exists -f: Regular file -d: Directory -r: Readable -w: Writable -x: Executable Example of using If Statement: Let’s illustrate the usage of if statements with a few examples...
在 Bash 中,not equal 函数由 -ne 字符表示。 != 运算符用于表示不等式。操作 ne 的逻辑结果是 True 或False。 not equal 表达式经常与 if 或elif 表达式组合以测试相等性并执行句子。 -ne 仅在括号包围它 [[]] 时有效。 [[Value1 -ne Value2]] Value1 通常是一个 bash 变量,而 Value2 是一个...
# trouble: script to demonstrate common errors number=1 if [ $number = 1 ]; then echo "Number is equal to 1." else echo "Number is not equal to 1." fi 1. 2. 3. 4. 5. 6. 7. 8. 9. 上面的脚本执行之后,会输出每一行命令。
["$var1"-ne"$var2"] && echo"$var1is not equal to$var2"home=/home/bozo [ -d"$home"] || echo"$homedirectory does not exist." (( ))结构扩展并计算一个算术表达式的值。如果表达式的结果为0,那么返回的退出状态码为1,或者是”假”。而一个非零值的表达式所返回的退出状态码将为0,或者是...
I have an problem. My hashed passwords are not equal to the passwords in my database when I retrieving the SALT-Value from database. register.php Generating a random salt to add it onto the end of the... 【云栖大会】Docker与阿里云达成战略合作 为企业级客户提供容器服务 ...