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fileYou can also connect many parameters.such as Sort-t ': '-K 3 testYou can think of it as something inside. xxx1:xxx2:xxx3:xxx4:xxx5means to sort the xxx3-T: Specifies a character to distinguish the key position-K:--key=pos1[pos1]. The sort starts with pos1, and if POS2 is specified, it ends at Pos2.| Redirects the output of the du command to the sort command.-r: Indicates descending order.Here is an example:4.3.21. grep [options] pattern [file]For example:grep t test//Search for text in test

ifMulti-branch statement practice#!/bin/bashread-p " Please enter 100 m running seconds: "IIf [$i-lt] [$i-GT 0]Thenecho " Enter the final "read-p " enter male and female "aif [$a = male]Thenecho " into the men's group "elif [$a = female]Thenecho " Enter the women's group "Elseecho "Error"Fielif [$i-ge 10]; Thenecho " elimination "Elseecho " Error "Fi Case Statement Practice, automatically unzip the compressed file according to the filename suffixVim untar.sh#!/bin/bashCase $ in*.gz)If [-F $]Th

(socket) and so on. [-R File] True if file exists and is readable [-s file] True if file exists and the size is not 0 [-T FD] True if the file descriptor FD is open and points to a terminal [-u file] True if file exists and set Suid (set UserID) [-W file] True if file exists and is writable [-x file] True if file exists and is executable [-O file] True if file exists and is a valid user ID [-G file] True if file exists and is a valid user group [-L file] True if file exists and is a symbolic co

Dear friends, everyone, the old boy's second book, "Shell Programming Combat" is about to meet with everyone (expected early January 2017)!Please participate in the selection of the color of the cover, loudly tell the old boy, time until December 22 22:00, your choice will directly determine the book's cover design, thank you!Please comment out the book like 1, b