就是因为source指令可以让脚本在当前bash(sh)中执行;而sh或者bash则会新启动一个...我们可以通过下面这个脚本做测试 # test.sh # 用一个数组保存进程ID和进程名 processInfo=() # 查找父进程的进程号 findParentID() { if [ $1...source source test.sh $$ processInfo: 40883 bash 可以见得没有启动...
是一种常见的操作,它允许我们在执行脚本时向脚本传递一些值或者参数。通过使用这些参数,我们可以在脚本中根据不同的需求执行不同的操作。 在bash脚本中,我们可以通过特殊变量$1、$2、$3等来获取传递...
In the above example, ##*. strips longest match for ‘*.’ which matches “bash.string.” so after striping this, it prints the remaining txt. And %%.* strips the longest match for .* from back which matches “.string.txt”, after striping it returns “bash”. 5. Find and Replace ...
and # strips from the front of the string, so it strips the substring “bash.” from the variable called filename. In second echo statement substring ‘.*’ matches the substring starts with dot, and % strips from back of the string, so it deletes the substring ‘.txt’ ...
1.for i in $(ls *.mp3) Bash 写循环代码的时候,确实比较容易犯下面的错误: for i in $(ls *.mp3); do # 错误! some command $i # 错误! done for i in $(ls) # 错误! for i in `ls` # 错误! for i in $(find . -type f) # 错误!
findis a powerful tool that can not only find files but it can run a command on each matching file too. In this lesson, we’ll learn how to find all the images that match a pattern and run an image optimization tool on them.
How you can find out the length of a string data in bash is shown in this tutorial by using different examples. Syntax: Any of the following syntaxes can be followed to count the length of string. ${#strvar} expr length $strvar expr“${strvar}”:’.*’ echo $strvar | wc -c ...
findis a powerful tool that can not only find files but it can run a command on each matching file too. In this lesson, we’ll learn how to find all the images that match a pattern and run an image optimization tool on them.
• [ -d file ]:如果 file 存在并且是一个目录,则为true。 [ file1 -ot file2 ]:如果 FILE1 比 FILE2 的更新时间更旧 • [ -s file ]:如果 file 存在且其长度大于零,则为true。 字符串判断 • [ string ]:如果string不为空(长度大于0),则判断为真。 • [ -n string ]:如果字符串str...
[ -s file ] 判断文件是否存在 [ -e file ] []和test功能一样 -a和-o(和,或) # --- 整数值比较判断 [ -eq ] [ "$a" = "0" ] (( a % 2 == 0 )) [ -n string ] string 的长度大于0 [ -z string ] string 的长度为0 string1=string2 字符串相等...