Three methods for Shell to read files by row,

Three methods for Shell to read files by row,

There are many methods for Shell to read files by row. The following three methods are written:

Statement 1:

#! /Bin/bash # Description: # while loop read Operations # Author: Standalone # version: 1.0 # Creation Time: 04: 08: 52 PATH =/bin:/sbin: /usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin :~ /Binexport PATHwhile read linedo echo $ linedone <filename (file to be read)

Statement 2:

#! /Bin/bash # Description: # cat Post-read Operations # Author: lone boat # version: 1.0 # Creation Time: 04: 08: 52 PATH =/bin:/sbin: /usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin :~ /Binexport PATHcat filename (file to be read) | while read linedo echo $ linedone

Statement 3:

#! /Bin/bash # Description: # for Loop read operations, which are different from while read Operations # Author: lone boat # version: 1.0 # Creation Time: 04: 08: 52 PATH =/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin :~ /Binexport PATHfor line in 'cat filename (file to be read) 'do echo $ linedone

Note: for Loop read row operations, which are different from while read rows

While is completely read by line, no matter how many paragraphs in the line;

For is read by row. If the text in the row contains spaces, it is read separately, that is, one string is read at a time.