...举个例子,如果我们需要对某个目录下的所有文件进行操作,可以使用for语句:for file in /path/to/dir/*do echo $filedone上述代码中,file为循环变量,/path...while语句while语句的语法如下:while conditiondo command1 command2 ...done其中,condition是一个判断条件,如果满足条件
/cidr-to-ip.sh [OPTION(only one)] [STRING/FILENAME] -h 显示此帮助屏幕 -f 在给定 STRING(s) 时强制检查网络边界 -i 将从输入文件中读取...(文件每行应包含一个 CIDR)(无网络边界检查) -b 与 -i 相同,但具有网络边界检查 #!.../bin/bash ### ## Methods ### prefix_to_bit_netmask......
ls #文件列表wc –l filewc -w filewc -c sourcefile #计算文件行数计算文件中的单词数计算文件中的字符数cp sourcefile destfile #文件拷贝mv oldname newname #重命名文件或移动文件rm file #删除文件grep'pattern'sourcefile #在文件内搜索字符串比如:grep's...
For example: vi demo.txt In the vi editor, pressito start theedit mode. PressESCto return to thecommand menu. TypeZZto save the file or:qto close the editor. To display the file content on prompt: cat For example: cat demo.txt To search for a string within a file: grep For exampl...
${variable//pattern/string} # the longest match to pattern in variable is replaced by string. All matches are replaced ${#varname} # returns the length of the value of the variable as a character string 1. 2. 3. 4. 5. 6.
--post-data=STRING use the POST method; send STRING as the data --post-file=FILE use the POST method; send contents of FILE --method=HTTPMethod use method "HTTPMethod" in the request --body-data=STRING send STRING as data. --method MUST be set --body-file=FILE send contents of FI...
-u file 若文件存在且设置了SUID位,则为真 -w file 若文件存在且可写,则为真 -x file 若文件存在且可执行,则为真 -o file 若文件存在且被有效用户ID所拥有,则为真 -z string 若string长度为0,则为真 -n string 若string长度不为0,则为真 ...
/bin/bash# Check if the number of arguments is less than 1if[$#-lt1];thenecho"Usage:$0<search_string>"exit1fi# Search for the provided string in the file "document.txt"search_string="$1"grep-q"$search_string"document.txt# Check the exit status of grepif[$?-eq0];thenecho"String...
You can create a .nvmrc file containing a node version number (or any other string that nvm understands; see nvm --help for details) in the project root directory (or any parent directory). Afterwards, nvm use, nvm install, nvm exec, nvm run, and nvm which will use the version ...
Using Google, search how to use regular expressions for string swapping for more information. #Alwaystest your perl regex on a test file to ensure it works before doing anything en masse to ensure you don't break anything. #How to find the location of largest disk usage if the disk is ...