Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: How to ignore Case with in COMM command?
Top Forums UNIX for Beginners Questions & Answers How to ignore Case with in COMM command? Post 302990203 by Don Cragun on Monday 23rd of January 2017 04:43:46 PM
Old 01-23-2017
As Jim said, comm needs both input files to be sorted. After case-shifting both of your sample input files to lowercase, they happen to be in sorted order. If that is not the case with your real data files, you will also need to sort them after shifting to lowercase.

I don't think you want the tr -s option. That suppresses repeated adjacent occurrences of the same character in the output. (For example:
Code:
echo HELLO | tr -s '[:upper:]' '[:lower:]'

would produce the output:
Code:
helo

note the LL in the input and the single l in the output.)

The process substitution feature Jim suggested is available in bash, some recent versions of ksh, and a few other shells; but it is not in the standards and is not available in many other shells. If you're using a shell that just supports POSIX standard features (and your input might need to be sorted), you could try something more like:
Code:
tr '[:upper:]' '[:lower:]' < x2.txt | sort > $$.2.txt
tr '[:upper:]' '[:lower:]' < x3.txt | sort > $$.3.txt
comm $$.[23].txt
rm -f $$.[23].txt

which creates copies of your input files that have been converted to lowercase and sorted, runs comm on the copies, and then removes the copies.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Ignore Case in Shell

Hi New to this Unix dot com. I would like to know how i can ignore the case in filename which is getting as user directoty to shell script. For Ex: Source (/aa/bb/patch/) Directory may contains more than 1 files as like 1. aa.csv or Aa.csv or AA.csv or aa.CSV 2. bb.csv 3. ... (3 Replies)
Discussion started by: AAH
3 Replies

2. Shell Programming and Scripting

Ignore case sensitive in Case Switch

In a Case switch, how to ignore case sensitive in the test: e.g. case "$field" in "TEST) action1;; *) action2;; esac How to go in action1 in case of $field = TEST , or Test , or test or .... without enumerating all possibilities... Thanks,... (1 Reply)
Discussion started by: annelisa
1 Replies

3. Shell Programming and Scripting

comm not working for this case. HELP!

I have two sorted files. newfile has records like: aaa|bbb|ccc||| ddd||eee|fff|| oldfile has records like: aaa|bbb|ccc| ggg||hhh|fff The output should like: ddd||eee|fff|| I use comm but it's not working for this case. comm -2 -3 newfile oldfile > difffile The difffile is the... (6 Replies)
Discussion started by: sslr
6 Replies

4. Shell Programming and Scripting

How do I ignore one character in a case statement? PLEASE HELP!

Hello, I am new to this forums. I need help with shell, and ksh in particular. I have a case statement that does something if -k. So it looks like: case $arg in -k) PUT=y, SEND=1 Thats all good and dandy. But now I want to change it where whether or not the user puts -k or not, it will do... (2 Replies)
Discussion started by: cpunisher
2 Replies

5. Programming

Ignore case in a test?

How do I ignore the case in an if condition..? EDIT: I put this in the wrong board...this is a linux script. if then echo "Same name." else echo "Different name." fi (1 Reply)
Discussion started by: Bandit390
1 Replies

6. Shell Programming and Scripting

how to ignore case

Hi All, The means I use to ignore case, as an example is the following snippet: It should accept any oof the following y|Y|YES|Yes|n|N|NO|No echo "Enter Y/N to continue: " read choice; (3 Replies)
Discussion started by: raghur77
3 Replies

7. Shell Programming and Scripting

To ignore user input case.

hi, i will like to know whether awk command can ignore case? i written a script that will take in user input and search for data on the 1st field from a text file. echo -n "Title:" read title awk -F":" '$1~/'"$title"'/{print $0}' Filename read ans return ... (5 Replies)
Discussion started by: Cheranime
5 Replies

8. Shell Programming and Scripting

simple but challenging ignore case

Folks - I found this code on the forums to extract a paragraph for a matching pattern but I don't know how to make it ignore case. grep "-ip" is not an option for me as I am on SUSE LINUX. Thanks for ur help. I run this script as below: grep_para.ksh sqlstate < logfile "The end result... (2 Replies)
Discussion started by: beowulfkid
2 Replies

9. UNIX for Dummies Questions & Answers

Is there a way to ignore CAPS or case sensitivity?

If I'm using a program that is expecting certain filenames and directories to be all CAPS, isn't there a way to ignore this in linux/cshell scripting? I.e., similiar to ignoring spaces with " (i.e., directory is directory 1, can ignore by typing "directory 1".) ?? (2 Replies)
Discussion started by: rebazon
2 Replies

10. Shell Programming and Scripting

Merge strings with ignore case

I have a bi-lingual database of a large number of dictionaries. It so happens that in some a given string is in upper case and in others it is in lower case. An example will illustrate the issue. toll Tax=पथ-कर Toll tax=राहदारी कर toll tax=टोल I want to treat all three instances of toll tax... (3 Replies)
Discussion started by: gimley
3 Replies

LEARN ABOUT OSX

mpi_comm_get_errhandler

MPI_Comm_get_errhandler(3OpenMPI)										 MPI_Comm_get_errhandler(3OpenMPI)

NAME

       MPI_Comm_get_errhandler	- Retrieves error handler associated with a communicator.

SYNTAX

C Syntax
       #include <mpi.h>
       int MPI_Comm_get_errhandler(MPI_Comm comm,
	    MPI_Errhandler *errhandler)

Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_COMM_GET_ERRHANDLER(COMM, ERRHANDLER, IERROR)
	    INTEGER   COMM, ERRHANDLER, IERROR

C++ Syntax
       #include <mpi.h>
       MPI::Errhandler MPI::Comm::Get_errhandler() const

INPUT PARAMETER

       comm	 Communicator (handle).

OUTPUT PARAMETERS

       errhandler
		 New error handler for communicator (handle).

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       MPI_Comm_get_errhandler retrieves the error handler currently associated with a communicator. This call is identical to MPI_Errhandler_get,
       the use of which is deprecated.

ERRORS

       Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ func-
       tions  do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism
       will be used to throw an MPI:Exception object.

       Before the error value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job, except  for
       I/O  function  errors. The error handler may be changed with MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN may be
       used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error.

       See the MPI man page for a full list of MPI error codes.

Open MPI 1.2							  September 2006				 MPI_Comm_get_errhandler(3OpenMPI)
All times are GMT -4. The time now is 06:10 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy