Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Need help with how to search a file for a variable string and delete that line
Top Forums UNIX for Beginners Questions & Answers Need help with how to search a file for a variable string and delete that line Post 303031312 by Don Cragun on Monday 25th of February 2019 10:57:11 PM
Old 02-25-2019
Quote:
Originally Posted by newbie_01
Thanks Don, I feel so small looking at what's missing, I thought when I tried //, that's it so I change it to a # but never thought about the \.
Hi newbie_01,
There is no reason to feel small. We're all here to learn. Next time you'll remember what you need to do.

Unfortunately you didn't tell us what operating system you're using. With a ksh with a 1988 vintage from many UNIX systems (including the Solaris system we could now guess that you're using), you can't get process substitution (you need a ksh93 for that). This is why it is so important for you to tell us what operating system and shell (including version numbers) you're using each time you start a thread so we know which operating system and shell extensions have a chance of working in your environment.

Even without process substitution, one could use something like:
Code:
#!/bin/ksh
IAm=${0##*/}
TmpFile=$IAm.$$
trap 'rm -rf "$TmpFile"' 0

sed 's/:.*$//' list.err > "$TmpFile"
/usr/xpg4/bin/grep -vf "$TmpFile" list.all

It isn't a one-liner, but it just invokes grep once, sed once, and rm once at the end to remove the temporary file it creates.

This should work on both Solaris and Linux systems (but you'll need to remove the /usr/xpg4/bin/ on the Linux system).
This User Gave Thanks to Don Cragun For This Post:
newbie_01
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Search for string in a file and extract another string to a variable

Hi, guys. I have one question: I need to search for a string in a file, and then extract another string from the file and assign it to a variable. For example: the contents of the file (group) is below: ... ftp:x:23: mail:x:34 ... testing:x:2001 sales:x:2002 development:x:2003 ...... (6 Replies)
Discussion started by: daikeyang
6 Replies

2. Shell Programming and Scripting

search string and delete the line

Hi All, I have a file from Mainframe which has one of the lines with so many words... i tried to fold, format to 80 chararcter.. stil did not work. So i have decided to search for a string in that line Ex.FLIGHT PLAN and once if it is found i want to delete the entire line. Please help... (2 Replies)
Discussion started by: digitalrg
2 Replies

3. Shell Programming and Scripting

search a string in a line and save it in a variable

Hi I want to read a file line by line and search for a particular string in each line(say for example string containing @ )and save that string into a variable. Can someone suggest me the way to implement it.I am using K- shell Thanks Ishita (5 Replies)
Discussion started by: Ishita
5 Replies

4. Shell Programming and Scripting

Search for a line, delete a string in it

let me start out by saying i have ZERO exp with any kind of scripting, so sorry if this is really basic stuff..... For example, I need to have a script that will search a file and find this line in the file: *.cat;dog;kennel;house;barn;horse;hay;coat hat and remove the "coat" from the... (12 Replies)
Discussion started by: skunky
12 Replies

5. Shell Programming and Scripting

Grep a string from input file and delete next three lines including the line contains string in xml

Hi, 1_strings file contains $ cat 1_strings /home/$USER/Src /home/Valid /home/Review$ cat myxml <projected value="some string" path="/home/$USER/Src"> <input 1/> <estimate value/> <somestring/> </projected> <few more lines > <projected value="some string" path="/home/$USER/check">... (4 Replies)
Discussion started by: greet_sed
4 Replies

6. UNIX for Dummies Questions & Answers

search for a string and delete it from the file

Hi , I am breaking my head from past one day ...to delete lines from a file which match to the string pattern.:wall: I am storing the search string in a variable and search if the file exists in the folder,if not delete that entry from the file. I am having problem to delete that line from... (2 Replies)
Discussion started by: rashmisb
2 Replies

7. Shell Programming and Scripting

Sed find exact string and delete line with variable

All, I am trying to read in a variable and search a file then delete based on that string, but i want to match exact word. This works but it matches all, i don't want to match anthing that contains the string, just the exact string. sed -i "/$feedname/d" file I tried sed... (1 Reply)
Discussion started by: markdjones82
1 Replies

8. Shell Programming and Scripting

Search a string in a text file and add another string at the end of line

Dear All I am having a text file which is having more than 200 lines. EX: 001010122 12000 BIB 12000 11200 1200003 001010122 2000 AND 12000 11200 1200003 001010122 12000 KVB 12000 11200 1200003 In the above file i want to search for string KVB... (5 Replies)
Discussion started by: suryanarayana
5 Replies

9. Shell Programming and Scripting

Search string within a file and list common words from the line having the search string

Hi, Need your help for this scripting issue I have. I am not really good at this, so seeking your help. I have a file looking similar to this: Hello, i am human and name=ABCD. How are you? Hello, i am human and name=PQRS. I am good. Hello, i am human and name=ABCD. Good bye. Hello, i... (12 Replies)
Discussion started by: royzlife
12 Replies

10. UNIX for Dummies Questions & Answers

Search for a string,delete the line and replace with new string in a file

Hi Everyone, I have a requirement in ksh where i have a set of files in a directory. I need to search each and every file if a particular string is present in the file, delete that line and replace that line with another string expression in the same file. I am very new to unix. Kindly help... (10 Replies)
Discussion started by: Pradhikshan
10 Replies

LEARN ABOUT MINIX

largefile

largefile(5)                                            Standards, Environments, and Macros                                           largefile(5)

NAME

       largefile - large file status of utilities

DESCRIPTION

       A  large file is a regular file whose size is greater than or equal to 2 Gbyte ( 2**31 bytes). A small file is a regular file whose size is
       less than 2 Gbyte.

   Large file aware utilities
       A utility is called large file aware if it can process large files in the same manner as it does small files. A utility that is large  file
       aware is able to handle large files as input and generate as output large files that are being processed. The exception is where additional
       files  are used as system configuration files or support files that can augment the processing. For example, the file utility supports  the
       -m  option  for  an  alternative "magic" file and the -f option for a support file that can contain a list of file names. It is unspecified
       whether a utility that is large file aware will accept configuration or support files that are large files. If a large file  aware  utility
       does  not accept configuration or support files that are large files, it will cause no data loss or corruption upon encountering such files
       and will return an appropriate error.

       The following /usr/bin utilities are large file aware:

       adb           awk           bdiff         cat           chgrp
       chmod         chown         cksum         cmp           compress
       cp            csh           csplit        cut           dd
       dircmp        du            egrep         fgrep         file
       find          ftp           getconf       grep          gzip
       head          join          jsh           ksh           ln
       ls            mdb           mkdir         mkfifo        more
       mv            nawk          page          paste         pathchck
       pg            rcp           remsh         rksh          rm
       rmdir         rsh           sed           sh            sort
       split         sum           tail          tar           tee
       test          touch         tr            uncompress    uudecode
       uuencode      wc            zcat

       The following /usr/xpg4/bin utilities are large file aware:

       awk           cp            chgrp         chown         du
       egrep         fgrep         file          grep          ln
       ls            more          mv            rm            sed
       sh            sort          tail          tr

       The following /usr/xpg6/bin utilities are large file aware:

       getconf       ls            tr

       The following /usr/sbin utilities are large file aware:

       install       mkfile        mknod         mvdir         swap

       See the USAGE section of the swap(1M) manual page for limitations of swap on block devices greater than 2 Gbyte on a 32-bit operating  sys-
       tem.

       The following /usr/ucb utilities are large file aware:

       chown         from          ln            ls            sed
       sum           touch

       The /usr/bin/cpio and /usr/bin/pax utilities are large file aware, but cannot archive a file whose size exceeds 8 Gbyte - 1 byte.

       The /usr/bin/truss utilities has been modified to read a dump file and display information relevant to large files, such as offsets.

   cachefs file systems
       The following /usr/bin utilities are large file aware for cachefs file systems:

       cachefspack      cachefsstat

       The following /usr/sbin utilities are large file aware for cachefs file systems:

       cachefslog       cachefswssize   cfsadmin         fsck
       mount            umount

   nfs file systems
       The following utilities are large file aware for nfs file systems:

       /usr/lib/autofs/automountd    /usr/sbin/mount
       /usr/lib/nfs/rquotad

   ufs file systems
       The following /usr/bin utility is large file aware for ufs file systems:

              df

       The following /usr/lib/nfs utility is large file aware for ufs file systems:

              rquotad

       The following /usr/xpg4/bin utility is large file aware for ufs file systems:

              df

       The following /usr/sbin utilities are large file aware for ufs file systems:

       clri          dcopy         edquota       ff            fsck
       fsdb          fsirand       fstyp         labelit       lockfs
       mkfs          mount         ncheck        newfs         quot
       quota         quotacheck    quotaoff      quotaon       repquota
       tunefs        ufsdump       ufsrestore    umount

   Large file safe utilities
       A  utility  is called large file safe if it causes no data loss or corruption when it encounters a large file. A utility that is large file
       safe is unable to process properly a large file, but returns an appropriate error.

       The following /usr/bin utilities are large file safe:

       audioconvert     audioplay    audiorecord    comm          diff
       diff3            diffmk       ed             lp            mail

       mailcompat       mailstats    mailx          pack          pcat
       red              rmail        sdiff          unpack        vi
       view

       The following /usr/xpg4/bin utilities are large file safe:

       ed            vi            view

       The following /usr/xpg6/bin utility is large file safe:

       ed

       The following /usr/sbin utilities are large file safe:

       lpfilter      lpforms

       The following /usr/ucb utilities are large file safe:

       Mail          lpr

       The following /usr/lib utility is large file safe:

              sendmail

SEE ALSO

       lf64(5), lfcompile(5), lfcompile64(5)

SunOS 5.10                                                          7 Nov 2003                                                        largefile(5)
All times are GMT -4. The time now is 12:58 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy