bash 编程sed sed编辑器 流编辑器 可以基于输入到命令行的或是存储在命令文件中的命令来处理数据流中的数据,它每次从输入中读取一行,用提供的编辑命令匹配数据,按命令中指定的方式修改流中的
/bin/bash #Declare bash string variable BASH_VAR="Bash Script" # echo variable BASH_VAR echo $BASH_VAR #when meta character such us "$" is escaped with "\" it will be read literally echo \$BASH_VAR # backslash has also special meaning and it can be suppressed with yet another "\"...
replace \s with [[:space:]] for POSIX sed/awk (1989ba9) ri: avoid interference on existing COMPREPLY (0a9d931) ri: fix wrongly quoted options to compgen (5248bbf) ri: properly split methods (910a5a0) ri: split classes using _comp_split (c95baa1) ri: work around localvar_inherit...
Replaces and with & and crushes out multiple blank lines. I use this for LinkedIn comments due to the short 1250 character limit shred_file.sh - overwrites a file 7 times to DoD standards before deleting it to prevent recovery of sensitive information shred_free_space.sh - overwrites free...
The presented utility, which is named t2s.sh, will read a text file and convert each tab to the specified number of space characters. Notice that the presented script replaces each tab character with 4 spaces but you can change that value in the code or even get it as command line argu...
blank A space or tab. word A sequence of characters considered as a single unit by the shell. Also known as a token. name A word consisting only of alphanumeric characters and underscores, and beginning with an alphabetic character or an underscore. Also referred to as an identifier. ...
BASH:replace text in files by sed #!/bin/sh TAG="aa:1234\/" DST="aa\/" for a in `find . -name '*.txt' -type f` do c=`cat ${a} | grep ${TAG}` reg=".*${TAG}.*" if [[ "${c}" =~ $reg ]] ; then cat ${a} | sed "s/${TAG}/${DST}/g"...
When writing shell scripts you may be in a situation where you need to pass multiline block of text or code to an interactive command. In Bash and other shells like Zsh a Here document (Heredoc) is a type of redirection that allows you to pass multiple l
print(line,file=sys.stdout)EOF# HereString 前面带-号,可以抑制文档内部的开头tab,注意不是spacecat<<-ENDOFMESSAGE This is line 1 of the message. This is line 2 of the message. This is line 3 of the message. This is line 4 of the message. ...
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