xargs | 易学教程

Can xargs' default delimiter be changed?

阅读更多关于 Can xargs' default delimiter be changed?

问题 I want the following behavior without having to explicitly specify it with options: xargs -d '\n' Unlike with most commands, you can't just use an alias because pipes don't recognize aliases (as a side-note, why is it designed this way?). I also tried creating my own ~/bin/xargs script but I think it's not as simple as reading "$@" as a string inside the script. Any suggestions how to make the delimiter a newline by default? I don't want to get a bunch of errors when I have a space in the

When to use xargs when piping?

阅读更多关于 When to use xargs when piping?

问题 I am new to bash and I am trying to understand the use of xargs , which is still not clear for me. For example: history | grep ls Here I am searching for the command ls in my history. In this command, I did not use xargs and it worked fine. find /etc - name "*.txt" | xargs ls -l I this one, I had to use xargs but I still can not understand the difference and I am not able to decide correctly when to use xargs and when not. 回答1: To answer your question, xargs can be used when you need to take

Alternatives to xargs -l

阅读更多关于 Alternatives to xargs -l

问题 I want to rename a bunch of dirs from DIR to DIR.OLD. Ideally I would use the following: find . -maxdepth 1 -type d -name \"*.y\" -mtime +`expr 2 \* 365` -print0 | xargs -0 -r -I file mv file file.old But the machine I want to execute this on has BusyBox installed and the BusyBox xargs doesn't support the "-I" option. What are some common alternative methods for collecting an array of files and then executing on them in a shell script? 回答1: You can use -exec and {} features of the find

How can I avoid “no input files” error from sed, when run from xargs?

阅读更多关于 How can I avoid “no input files” error from sed, when run from xargs?

问题 I have this shell script to update IP addresses in my configuration files (any that match $old_address_pattern must be changed to $new_address ): grep -rl "$old_address_pattern" /etc \ | xargs sed -i "s/$old_address_pattern/$new_address/g" If the grep command finds no matching files, then sed will complain 'no input files'. How can I make this pipeline succeed when the list of files is empty? 回答1: If you want to avoid running sed when grep produces no output, then (since you've tagged this

Search and Replace String from text file Ubuntu

阅读更多关于 Search and Replace String from text file Ubuntu

问题 I have to replace following String //@Config(manifest with below string, @Config(manifest So this i created following regex \/\/@Config\(manifest And tried grep -rl \/\/@Config\(manifest . | xargs sed -i "\/\/@Config\(manifest@Config\(manifest/g" But i am getting following error: sed: -e expression #1, char 38: Unmatched ( or \( I have to search recursively and do this operation, though i am stuck with above error. 回答1: grep -rl '//@Config(manifest' | xargs sed -i 's|//@Config(manifest|

常用Linux命令行技巧

阅读更多关于常用Linux命令行技巧

结果以表格形式输出 column -t 比如； mount | column -t 默认分隔符为空格，如果输出文件是以别的字符进行分割的呢，比如 /etc/passwd 中的冒号，那么，我们可以通过 -s 参数来指定 cat /etc/passwd | column -t -s: 重复执行某个命令直至执行结果成功 while true 按内存使用大小列出进程信息 ps aux | sort -rnk 4 按CPU使用情况列出进程信息 ps aux | sort -nk 3 同时查看多个日志文件 multitail file1.log file2.log 返回之前目录 cd - 调整非交互式Shell为交互式将设置从 ~/.bashrc 调整为 ~/.bash_profile ，更多请参考 https://blog.csdn.net/kangkanglou/article/details/82698177 Different shell types: interactive, non-interactive, login 定时获取命令输出 watch 命令 watch df -h 会话结束后仍然可正常运行程序命令 nohup 命令忽略所有挂断信号 nohup ping -c 10 www.baidu.com 自动输入Yes或者No 自动输入 yes ，使用 yes 命令 yes |

Format all XML files in a directory and save them in a subdirectory

阅读更多关于 Format all XML files in a directory and save them in a subdirectory

问题 I'm trying to write a script that will look through a directory, find all the XML files, run them through xmllint , and save the formatted results to a file of the same name in a subdirectory called formatted . Here's the script I have so far: find . -maxdepth 1 -type f -iname "*.xml" | xargs -I '{}' xmllint --format '{}' > formatted/'{}' This works, to an extent. The subdirectory ends up with one file, named "{}" , which is just the results of the final file that was processed through

cat/Xargs/command VS for/bash/command

阅读更多关于 cat/Xargs/command VS for/bash/command

问题 The page 38 of the book Linux 101 Hacks suggests: cat url-list.txt | xargs wget –c I usually do: for i in `cat url-list.txt` do wget -c $i done Is there some thing, other than length, where the xargs-technique is superior to the old good for-loop-technique in bash? Added The C source code seems to have only one fork. In contrast, how many forks have the bash-combo? Please, elaborate on the issue. 回答1: From the Rationale section of a UNIX manpage for xargs. (Interestingly this section doesn't

find with xargs and tar

阅读更多关于 find with xargs and tar

问题 I have the following I want to do: find . -maxdepth 6 ( -name *.tar.gz -o -name bediskmodel -o -name src -o -name ciao -o -name heasoft -o -name firefly -o -name starlink -o -name Chandra ) -prune -o -print| tar cvf somefile.tar --files-from=- i.e. exclude a whole lot of stuff, only look to 6 subdirs depth, and then once pruning is done, tar up the rest. Not hard. The bit before the pipe (|) works 100%. If I exclude the tar, then I get what I'm after (to the screen). But once I include the

centos7上借助于xargs快速查询并卸载rpm软件

阅读更多关于 centos7上借助于xargs快速查询并卸载rpm软件

在centos上卸载某些软件的时候，如果查询的软件包比较多，可以考虑使用xargs，边查询边卸载如：下面在查询mysql包时候，将查询结果通过管道传送给xargs，然后使用rpm -e --nodeps进行卸载当然如果你不想使用这种方式，那就直接用yum吧！来源： https://www.cnblogs.com/cosmos-wong/p/11992940.html