Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Read loop from two files using descriptors
Top Forums Shell Programming and Scripting Read loop from two files using descriptors Post 302907637 by RudiC on Monday 30th of June 2014 04:12:26 PM
Old 06-30-2014
You can grep -fgrplist on stdin from a pipe.

Nested loops look like e.g.
Code:
while read atd
   do while read grp
         do  your_commands
         done < GRPLIST
   done < ATDINFILE

The outer loop reads the jobs one by one, and the inner does the comparisons for the entire grp file for every single job.
These 2 Users Gave Thanks to RudiC For This Post:
rbatte1 woodson2
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

help with a 'while read' loop to change the names of files

Hi, I am new to scripting, so any help on this would be much appreciated. I am trying to rename a bunch of files, taking the names sequentially from a list read in another file... # ls oldnames file_1 file_2 file_3 # cat names red yellow green I want the files to take on the... (6 Replies)
Discussion started by: starsky
6 Replies

2. UNIX for Dummies Questions & Answers

how to list the files using File Descriptors

hello, I have written a script named listall.sh with the following codes init. #!/bin/bash PATH="/proj/cmon/$1" echo $PATH if ; then echo "Usage: $0 ***" exit 1 else ls -l $PATH/*.sc fi Here there are 3 subdirectories (namely - src, data and jobs)under /proj/cmon, so... (2 Replies)
Discussion started by: shyjuezy
2 Replies

3. UNIX for Dummies Questions & Answers

Write/read to file descriptors

Is it possible to write to file descriptor 0 and read from 1 or 2? How could this be implemented? (3 Replies)
Discussion started by: machshev
3 Replies

4. UNIX for Dummies Questions & Answers

how to access files via their descriptors?

hello, I'm new here, and new to Linux. I was wondering how to get hold of a certain file's descriptor, and how to use that number so that I access the contents of the file. please give me a full example, that is (1) how to determine the descriptor and (2) what magic symbols to use so that... (4 Replies)
Discussion started by: ialoq
4 Replies

5. UNIX for Advanced & Expert Users

read() wont allow me to read files larger than 2 gig (on a 64bit)

Hi the following c-code utilizing the 'read()' man 2 read method cant read in files larger that 2gig. Hi I've found a strange problem on ubuntu64bit, that limits the data you are allowed to allocate on a 64bit platform using the c function 'read()' The following program wont allow to allocate... (14 Replies)
Discussion started by: monkeyking
14 Replies

6. Shell Programming and Scripting

until loop and read

Hi guys what I wanna do is to create a script where can I input several times a file - assume with read function that will be inserted into a temp. file for further processing. When I press q I want that the loop will stop and continue in my script I typed this but the options q is not working... (6 Replies)
Discussion started by: kl1ngac1k
6 Replies

7. Shell Programming and Scripting

Read and edit multiple files using a while loop

Hi all, I would like to simply read a file which lists a number of pathnames and files, then search and replace key strings using a few vi commands: :1,$s/search_str/replace_str/g<return> but I am not sure how to automate the <return> of these vis commands when I am putting this in a... (8 Replies)
Discussion started by: cyberfrog
8 Replies

8. UNIX for Dummies Questions & Answers

Read statement within while read loop

hi, this is my script #!/bin/ksh cat temp_file.dat | while read line do read test if ]; then break else echo "ERROR" fi done when i execute this code , the script does wait for the user input . it directly prints "ERROR" and terminates after the no. of times as there... (3 Replies)
Discussion started by: siva1612
3 Replies

9. Shell Programming and Scripting

For loop inside awk to read and print contents of files

Hello, I have a set of files Xfile0001 - Xfile0021, and the content of this files (one at a time) needs to be printed between some line (lines start with word "Generated") that I am extracting from another file called file7.txt and all the output goes into output.txt. First I tried creating a for... (5 Replies)
Discussion started by: jaldo0805
5 Replies

10. Programming

Read .xlsx and text files in a loop using openpyxl

I have a list of .xlsx files (names 1.xlsx, 2.xlsx etc) in a directory, on which I need to insert data from its corresponding text file (named 1.txt, 2.txt etc) on the second worksheet named 'Filtered' and save it. The code I am trying is #!/usr/bin/python import os from... (8 Replies)
Discussion started by: nans
8 Replies

LEARN ABOUT DEBIAN

grp

grp.h(3HEAD)                                                          Headers                                                         grp.h(3HEAD)

NAME

       grp.h, grp - group structure

SYNOPSIS

       #include <grp.h>

DESCRIPTION

       The <grp.h> header declares the structure group, which includes the following members:

       char  *gr_name     /* name of the group */
       gid_t gr_gid       /* numerical group ID */
       char  **gr_mem     /* pointer to a null-terminated array of character */
                          /* pointers to member names */

       The gid_t type is defined as described in <sys/types.h> (see types(3HEAD)).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Interface Stability          |Standard                     |
       +-----------------------------+-----------------------------+

SEE ALSO

       getgrnam(3C), types.h(3HEAD), attributes(5), standards(5)

SunOS 5.10                                                          10 Sep 2004                                                       grp.h(3HEAD)
All times are GMT -4. The time now is 04:41 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy