Unix some practical but unknown commands

There are many Linux commands that come to mind, some of which are unknown, while others are common, as follows:

Xargs or parallel: running some programs in parallel, there are many options for commands

Sed and awk: a well-known and useful command for working with text files, faster than Python and Ruby

M4: simple macro processing commands

Screen: a powerful terminal reuse and session persistence tool, see http://www.ibm.com/developerworks/cn/linux/l-cn-screen/ for details

Yes: for more information on repeated output strings, please see http://codingstandards.iteye.com/blog/826940.

Cal: a very beautiful calendar

Env: run a command, which is very useful in scripts

Look: find English words that start with a string

Cut and paste and join: data manipulation command

Fmt: format a text segment

Pr: format a string of text or a larger file in page / column units, see http://hi.baidu.com/mchina_tang/item/1ce11d5d317dfc05aaf6d70d for details

Fold: wrapping text

Column: formatting text into columns or tables

Expand and unexpand: converting between tabs and spaces

Nl: add line number

Seq: print line number

Bc: calculator

Factor: the factor of the output integer, and the prime factor of the integer output by factor

Nc: network debugging and data transfer

Dd: moving data between files and devices

File: determine the type of a file

Stat: viewing file statu

Tac: outputs the contents of the file from the last line, as opposed to the cat output

Shuf: randomly selects data by row for a file

Comm: compare an ordered file by line

Hd and bvi: exporting or editing binaries

Strings: viewing the contents of binaries

Tr: character translation or manipulation character

Iconv or uconv: converting encoded strings

Split and csplit: dividing files

7z: compressed files with high compression rate

Ldd: viewing dynamic library information

Nm: view the symbol table in the target file

Ab: a stress testing tool for website servers

Strace: debugging system calls

Mtr: better route tracking tool for network debugging

Cssh: visual concurrent shell

Wireshark and tshark: packet capture and network debugging

Host and dig: finding DNS

Lsof: view process file descriptors and socket information

Dstat: a useful tool for system data statistics

Iostat: CPU and disk usage statistics

Htop: an improved version of top

Last: login history

W: currently logged in user

Id: view user / group presentation information

Sar: view Historical system Statistics tool

Iftop or nethogs: check the network utilization of socket or process

Ss: viewing statistics

Dmesg: boot or system error message

(Linux) hdparm: displays or sets disk parameters

(Linux) lsb_release: view linux system release information

(Linux) lshw: view hardware information

Fortune, ddate, and sl: it depends on whether you think the steam engine or Bibi quotation is useful.