Sponsored Content
Top Forums Shell Programming and Scripting cat file1 read line-per-line then grep -A 15 lines down in fileb Post 302280516 by otheus on Tuesday 27th of January 2009 06:47:17 AM
Old 01-27-2009
So you want to find in $FILE each line from $SEARCHFILE, and then get the next 15 lines from $FILE?

Code:
cat $SEARCHFILE | 
while read search; do
   grep -A 15 -F -- "$search" $FILE
done

 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

using 'cat' to in 'while read line'

Hi, I'm having some trouble reading a file that was 'cat' through a while loop. Can anyone suggest alternatives? what i do is cat filename|grep *.stuff while read line do echo $line ... and other commands done The cat,grep line seems to work correctly, but the script hangs when i add in... (3 Replies)
Discussion started by: chugger06
3 Replies

2. Shell Programming and Scripting

Compare multiple fields in file1 to file2 and print line and next line

Hello, I have two files that I need to compare and print out the line from file2 that has the first 6 fields matching the first 6 fields in file1. Complicating this are the following restrictions 1. file1 is only a few thousand lines at most and file2 is greater than 2 million 2. I need to... (7 Replies)
Discussion started by: gillesc_mac
7 Replies

3. UNIX for Advanced & Expert Users

how do you parse 1 line at a time of file1 ie. line(n) each line into new file

File 1 <html>ta da....unique file name I want to give file=>343...</html> <html>da ta 234 </html> <html>pa da 542 </html> and so on... File 2 343 234 542 and so on, each line in File 1 one also corresponds with each line in File 2 I have tried several grep, sed, while .. read, do,... (4 Replies)
Discussion started by: web_developer
4 Replies

4. Shell Programming and Scripting

bash: read file line by line (lines have '\0') - not full line has read???

I am using the while-loop to read a file. The file has lines with null-terminated strings (words, actually.) What I have by that reading - just a first word up to '\0'! I need to have whole string up to 'new line' - (LF, 10#10, 16#A) What I am doing wrong? #make file 'grb' with... (6 Replies)
Discussion started by: alex_5161
6 Replies

5. UNIX for Dummies Questions & Answers

Find a value inside file1 and replace it with another value from another fileB

i have a file with some data and i need replace a perticular value with some other value from another another file req: file1.txt abc,idle.txt,1234 file2.txt 5678 now the requirement is need to replace the "idle.txt" is with "mike_5678" here 5678 from file2.txt... file2.txt contains only... (2 Replies)
Discussion started by: dssyadav
2 Replies

6. Shell Programming and Scripting

Using regex's from file1, print line and line after matches in file2

Good day, I have a list of regular expressions in file1. For each match in file2, print the containing line and the line after. file1: file2: Output: I can match a regex and print the line and line after awk '{lines = $0} /Macrosiphum_rosae/ {print lines ; print lines } ' ... (1 Reply)
Discussion started by: pathunkathunk
1 Replies

7. Shell Programming and Scripting

Match single line in file1 to groups of lines in file2

I have two files. File 1 is a two-column index file, e.g. comp11084_c0_seq6:130-468(-) comp12746_c0_seq3:140-478(+) comp11084_c0_seq3:201-539(-) comp12746_c0_seq2:191-529(+) File 2 is a sequence file with headers named with the same terms that populate file 1. ... (1 Reply)
Discussion started by: pathunkathunk
1 Replies

8. Shell Programming and Scripting

Need a program that read a file line by line and prints out lines 1, 2 & 3 after an empty line...

Hello, I need a program that read a file line by line and prints out lines 1, 2 & 3 after an empty line... An example of entries in the file would be: SRVXPAPI001 ERRO JUN24 07:28:34 1775 REASON= 0000, PROCID= #E506 #1065: TPCIPPR, INDEX= 003F ... (8 Replies)
Discussion started by: Ferocci
8 Replies

9. Shell Programming and Scripting

Read the file line by line and do something with lines

I have a file file_name_O.txt The file can have different number of other files names or nothing I will check cnt=`wc -l file_name_0.txt` if ;then exit 1 fi Now I have to start checking file names, i.e. read txt file line by line. If amount of ,lines equal 1, I can... (4 Replies)
Discussion started by: digioleg54
4 Replies

10. UNIX for Beginners Questions & Answers

Get an output of lines in pattern 1st line then 10th line then 11th line then 20th line and so on.

Input file: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 (6 Replies)
Discussion started by: Sagar Singh
6 Replies
CAT(1)							      General Commands Manual							    CAT(1)

NAME
cat, read, nobs - catenate files SYNOPSIS
cat [ file ... ] read [ -m ] [ -n nline ] [ file ... ] nobs [ file ... ] DESCRIPTION
Cat reads each file in sequence and writes it on the standard output. Thus cat file prints a file and cat file1 file2 >file3 concatenates the first two files and places the result on the third. If no file is given, cat reads from the standard input. Output is buffered in blocks matching the input. Read copies to standard output exactly one line from the named file, default standard input. It is useful in interactive rc(1) scripts. The -m flag causes it to continue reading and writing multiple lines until end of file; -n causes it to read no more than nline lines. Read always executes a single write for each line of input, which can be helpful when preparing input to programs that expect line-at-a- time data. It never reads any more data from the input than it prints to the output. Nobs copies the named files to standard output except that it removes all backspace characters and the characters that precede them. It is useful to use as $PAGER with the Unix version of man(1) when run inside a win (see acme(1)) window. SOURCE
/src/cmd/cat.c /src/cmd/read.c /bin/nobs SEE ALSO
cp(1) DIAGNOSTICS
Read exits with status eof on end of file or, in the -n case, if it doesn't read nlines lines. BUGS
Beware of and which destroy input files before reading them. CAT(1)
All times are GMT -4. The time now is 10:57 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy