if [ -x file1 ] # file1 exists and is executable if [ -d dir1 ] # dir1 exist if [ file1 -nt file2 ] # file1 new than file2 if [ file1 -ot file2 ] # file1 old than file2 if [ -z string ] # string length is 0 if [ -n string ] # string length is not 0 if...
fi if [ -x filename ]; then echo "File is executable." else echo "File is not executable." fi 判断文件大小: 使用stat 命令或 ls -l 命令结合 awk 或其他文本处理工具来判断文件大小。 bash filesize=$(stat -c%s filename) if [ $filesize -gt 100000 ]; then echo "File size is gre...
On major systems, “[“ is offered as an executable, and to check if your system has any such executable, run:which [/usr/bin/[If a path is printed on the terminal, we can also run the following, which prints the help section of the man page to the terminal....
-u file True if file exists and its set-user-id bit is set. -w file True if file exists and is writable. -x file True if file exists and is executable. -G file True if file exists and is owned by the effective group id. ...
-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: Example 1: Numeric Comparison !/bin/bash count=10 ...
-x:Executable...可执行 ... 条件判断的表达式: [ expression ] 注意[] 最左和左右需要空格,这里linux把表达式当成命令来判断 ` expression ` 同样需要注意空格,这里linux把表达式当成关键字来判断,至于两者区别,暂时存疑 test expression 命令间的逻辑
is readable-s FILE_NAM # TrueifFILE_NAM existsandisnotempty-w FILE_NAM # TrueifFILE_NAM has write permission-x FILE_NAM # TrueifFILE_NAM is executable#字符串测试操作-z STRING # TrueifSTRING is empty-n STRING # TrueifSTRING isnotemptySTRING1...
if [ -d /tmp/test ] then echo "The directory exists" fiCopy This script checks for the directory/tmp/test. If it exists, the system displaysThe directory exists. 3. UseCtrl-oto save the file, thenCtrl-xto exit. Then,run the scriptby entering: ...
filename=$1if[ -e $filename ]thenecho"$filename exists"elseecho"$filename NOT exists"fiecho"The End" if后面的“-e $filename”作为判断条件。如果条件成立,即文件存在,那么执行then部分的代码块。如果文件不存在,那么脚本将执行else语句中的echo命令。末尾的fi结束整个语法结构。脚本继续以顺序的方式执行...
As you can see the filemath.shexists! Most of the time when you’re writing bash scripts you won’t be comparing two raw values or trying to find something out about one raw value, instead you’ll want to create a logical statement about a value contained in a variable. Variables behav...