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Top Forums Shell Programming and Scripting Reading multiple lines in a file Post 302972646 by Ali Sarwar on Monday 9th of May 2016 07:23:21 AM
Old 05-09-2016
Hammer & Screwdriver Reading multiple lines in a file

Hello, I am new in shell scripting. I need help regarding following.

I have 4 files generated by backups daily. I have stored the names of these 4 files into one file. i.e I have 4 files names as a, b, c & d and these names have been put into one file abcd.txt.

Now I want to cat each file in abcd.txt and grep for a string and put the output in another file.

I am not able to sort it out for myself and would appreciate if anyone can help me in this.

Regards,
Ali
 

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TAIL(1) 						      General Commands Manual							   TAIL(1)

NAME
tail - deliver the last part of a file SYNOPSIS
tail [ +-number[lbc][rf] ] [ file ] tail [ -fr ] [ -n nlines ] [ -c nbytes ] [ file ] DESCRIPTION
Tail copies the named file to the standard output beginning at a designated place. If no file is named, the standard input is copied. Copying begins at position +number measured from the beginning, or -number from the end of the input. Number is counted in lines, 1K blocks or bytes, according to the appended flag or Default is -10l (ten ell). The further flag causes tail to print lines from the end of the file in reverse order; (follow) causes tail, after printing to the end, to keep watch and print further data as it appears. The second syntax is that promulgated by POSIX, where the numbers rather than the options are signed. EXAMPLES
tail file Print the last 10 lines of a file. tail +0f file Print a file, and continue to watch data accumulate as it grows. sed 10q file Print the first 10 lines of a file. SOURCE
/src/cmd/tail.c BUGS
Tails relative to the end of the file are treasured up in a buffer, and thus are limited in length. According to custom, option +number counts lines from 1, and counts blocks and bytes from 0. Tail is ignorant of UTF. TAIL(1)
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