Shulou(Shulou.com)06/01 Report--

This article mainly explains "what are the bash commands to improve production efficiency". The explanation in the article is simple and clear and easy to learn and understand. Please follow the editor's train of thought to study and learn "what are the bash commands to improve production efficiency"?

Tip 1. Use the command line to add text to the top of the file

Every time I find out how to write this command again. Here's how to use sed to add a line to the top of a file:

The code is as follows:

Sed-I '1s/ ^ / line to insert\ nUniverse' path/to/file/you/want/to/change.txt

Tip 2. Insert multiple lines of text into the configuration file using the command line

This method is very simple, and as many people know, here is how to insert multiple lines of text into a file using the command line. The "here document" syntax is used here, which allows you to insert paragraphs into a file through block text symbols, usually using EOF (meaning "End Of File"):

The code is as follows:

Cat > > path/to/file/to/append-to.txt ~ / .sdirs1

Mv / .sdirs1 ~ / .sdirs

Echo "export DIR_$1=$PWD" > > ~ / .sdirs

}

# jump to bookmark

Function g {

Source / .sdirs

Cd $(eval $(echo echo $(echo\ $DIR_$1)

}

# list bookmarks with dirnam

Function l {

Source / .sdirs

Env | grep "^ DIR_" | cut-c5-| grep "^. * ="

}

# list bookmarks without dirname

Function _ l {

Source / .sdirs

Env | grep "^ DIR_" | cut-c5-| grep "^. * =" | cut-F1-d "="

}

# completion command for g

Function _ gcomp {

Local curw

COMPREPLY= ()

Curw=$ {COMP_ WORDS[COMP _ CWORD]}

COMPREPLY= ($(compgen-W '`_ l`-- $curw))

Return 0

}

# bind completion command for g to _ gcomp

Complete-F _ gcomp g

Tip 7. Extract a column from the formatted output (my most commonly used awk technique)

I use it almost every day. Really. There is often some output, and all I need is the second or third column, and the following command can do this:

The code is as follows:

# Sample output of git status-s command:

$git status-s

M .bashrc

?? .vim / bundle/extempore/

# Remove status code from git status and just get the file names

$git status-s | awk'{print $2}'

.bashrc

.vim / bundle/extempore/

Why not write a function so that we can use it at any time?

The code is as follows:

Function col {

Awk-v col=$1'{print $col}'

}

This makes it very easy to extract columns, for example, you don't want the first column? Simple:

The code is as follows:

$git status-s | col 2

.bashrc

.vim / bundle/extempore/

Tip 8. Ignore the first x words

I am fascinated by xargs. I feel like a sharp knife. But sometimes the results you get with it need to be adjusted, and you may need to get some values. For example, you want to remove some information from the following file image:

The code is as follows:

Function skip {

(($1 + 1))

Cut-d ''- frenn-

}

Here's how to use it:

Use docker images to get the following output:

The code is as follows:

$docker images

REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE

65a9e3ef7171 3 weeks ago 1.592 GB

7c01ca6c30f2 3 weeks ago 11.1 MB

9518620e6a0e 3 weeks ago 7.426 MB

430707ee7fe8 3 weeks ago 7.426 MB

Boot2docker/boot2docker latest 1dbd7ebffe31 3 weeks ago 1.592 GB

Spaceghost/tinycore-x86_64 5.4 f47686df00df 7 weeks ago 11.1 MB

Durdn/bithub latest df1e39df8dbf 8 weeks ago 100.9 MB

C5e6cf38d985 8 weeks ago 100.9 MB

Nginx latest e426f6ef897e 12 weeks ago 100.2 MB

Zoobab/tinycore-x64 latest 8cdd417ec611 8 months ago 7.426 MB

Scratch latest 511136ea3c5a 20 months ago 0 B

Using the above function, you can get all the IDs:

The code is as follows:

$docker images | col 3

IMAGE

65a9e3ef7171

7c01ca6c30f2

9518620e6a0e

430707ee7fe8

1dbd7ebffe31

F47686df00df

Df1e39df8dbf

C5e6cf38d985

E426f6ef897e

8cdd417ec611

511136ea3c5a

Further processing:

The code is as follows:

Docker images | col 3 | xargs

IMAGE 65a9e3ef7171 7c01ca6c30f2 9518620e6a0e 430707ee7fe8 1dbd7ebffe31 f47686df00df df1e39df8dbf c5e6cf38d985 e426f6ef897e 8cdd417ec611 511136ea3c5a

But I also want to remove the previous "IMAGE" character:

The code is as follows:

Docker images | col 3 | xargs | skip 1

65a9e3ef7171 7c01ca6c30f2 9518620e6a0e 430707ee7fe8 1dbd7ebffe31 f47686df00df df1e39df8dbf c5e6cf38d985 e426f6ef897e 8cdd417ec611 511136ea3c5a

Write it down in its entirety, and that's it:

The code is as follows:

Docker rmi $(docker images | col 3 | xargs | skip 1)

Tip 9. Create your own command package

In bash, you can easily create your own command components. You can take a look at what I wrote below:

The code is as follows:

Function dur {

Case $1 in

Clone | cl)

Git clone git@bitbucket.org:nicolapaolucci/$2.git

Move | mv)

Git remote add bitbucket git@bitbucket.org:nicolapaolucci/$ (basename $(pwd)) .git

Git push-all bitbucket

Trackall | tr)

# track all remote branches of a project

For remote in $(git branch-r | grep-v master); do git checkout-- track $remote; done

Key | k)

# track all remote branches of a project

Ssh $2 'mkdir-p. Ssh & & cat > > .ssh / authorized_keys' < ~ / .ssh/id_rsa.pub

Fun | f)

# list all custom bash functions defined

Typeset-F | col 3 | grep-v _ | xargs | fold-sw 60

Def | d)

# show definition of function $1

Typeset-f $2

Help | h | *)

Echo "[dur] dn shell automation tools"

Echo "commands available:"

Echo "[cl] one, [mv | move]"

Echo "[f] fun lists all bash functions defined in .bashrc"

Echo "[def] lists definition of function defined in .bashrc"

Echo "[k] ey copies ssh key to target host"

Echo "[tr] ackall], [h] elp"

Esac

}

With the script above, I can copy ssh key to any web server-- just type dur key user@somehost.

Thank you for your reading, the above is the content of "what are the bash commands to improve production efficiency". After the study of this article, I believe you have a deeper understanding of what bash commands to improve production efficiency, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.