Sed awk notes (ii)

All said that the SED awk maintenance personnel's necessary tools, starting today to organize related notes, first of all to meet these two things.

Commonality: Using the same syntax [Address]/pattern/action/flag

is a character stream-oriented, read input from a bank at a time, and output to standard output, which is input-driven

are pattern-matching using regular expressions.

Allows the user to specify instructions in the script

So the individual thinks there are several aspects that need to break through: grammar, regularization, scripting ideas

[[email protected] test] #今天写的脚本显示洲及所在州的人名

#! /bin/sh

Awk-f "," ' {print $4 ', ' $} ' $* | Sort |

Awk-f "," '

$ = = LastState {print "\t\t"

$ = laststate {LastState = $1;print $1;print "\t\t" $} '

List file

John daggett,341 King Road,plymouth MA

Alice ford,22 East Broadway,richmond VA

Terry kalkas,402 Lans road,beaver Falls PA

Amy wilde,334 Bayshore Pkwy,mountain View CA

Eric adans,20 Post Road,sudbury MA

Sal carpenter,73 6th Street,boston MA

SEDSCR Processing files

s/mq/, mqwwqdhuw355w/

s/ma/, mmmmmmmmmmmm/

s/pa/, penccccccccccc/

s/ca/, california/

s/va/, virginia/

s/ok/, oklahoma/

Command Sed-f SEDSCR | Bystate output

California

Amy Wilde

Mmmmmmmmmmmm

Eric Adans

John Daggett

Sal Carpenter

Penccccccccccc

Terry Kalkas

Virginia

Alice Ford

This place has a program that is how to write your own shell programming executable

chmod +x bystate Grant Execute permission

./bystate or bash bystate execution

If prompted Bystate is not an executable program export path= $PATH:/home/test #my bystate in/home/test/

This article from "Yun Weibang" blog, declined reprint!

Sed awk notes (ii)