Merge pull request #157 from felixonmars/master

README: add pip installation command for python client
split git commands
Merge pull request #159 from kxy/master

split git commands
added ipcs.md
fixed a typo
more typos
Merge pull request #160 from kxy/master

add ipcs.md (#103)
add wpa_cli
Merge pull request #161 from Gubolin/master

add wpa_cli
added ar.md
Merge pull request #162 from kxy/master

add ar.md (#104)
Add user password -u option to Curl
Merge pull request #163 from Florent2/patch-1

Add user password -u option to Curl
add xargs
Merge branch 'master' of https://github.com/Gubolin/tldr-1

merge
Merge pull request #165 from Gubolin/master

add xargs
Improved tail.md
Merge pull request #167 from brunoduran/master

Improved tail.md
Added Linux and Jetbrains coverage to gitignore
Added useradd.md with most relevant use cases