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 303031189 by RudiC on Saturday 23rd of February 2019 05:21:14 AM
Old 02-23-2019
On top of what Don Cragun already said, your script runs several commands per error list line, which might be considered not too efficient, esp. when dealing with long files. How about condensing the entire script down to a one liner with one grep and one sed only, making use of "process substitution" available in ksh et al.? Like
Code:
grep -vf<(sed -n 's/:.*$//; 1h;1!H; ${g;p}' list.err) list.all
'/two/two/two/two',
'/four/four/four/four',
'/six/six/six/six',
'/eight/eight/eight/eight',
'/ten/ten/ten/ten',

Last edited by RudiC; 02-23-2019 at 06:47 AM..
 

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

grep

GREP(1) 						      General Commands Manual							   GREP(1)

NAME

       grep - search a file for lines containing a given pattern

SYNOPSIS

       grep [-elnsv] pattern [file] ...

OPTIONS

       -e     -e pattern is the same as pattern

       -c     Print a count of lines matched

       -i     Ignore case

       -l     Print file names, no lines

       -n     Print line numbers

       -s     Status only, no printed output

       -v     Select lines that do not match

EXAMPLES

       grep mouse file	   # Find lines in file containing mouse

       grep [0-9] file	   # Print lines containing a digit

DESCRIPTION

       Grep  searches  one  or	more  files (by default, stdin) and selects out all the lines that match the pattern.  All the regular expressions
       accepted by ed and mined are allowed.  In addition, + can be used instead of * to mean 1 or more occurrences, ? can be used to mean 0 or  1
       occurrences,  and  |  can  be used between two regular expressions to mean either one of them.  Parentheses can be used for grouping.  If a
       match is found, exit status 0 is returned.  If no match is found, exit status 1 is returned.  If an error is detected,  exit  status  2	is
       returned.

SEE ALSO

       cgrep(1), fgrep(1), sed(1), awk(9).

																	   GREP(1)
All times are GMT -4. The time now is 08:18 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy