Sponsored Content
Full Discussion: Deleting lines from a file
Top Forums UNIX for Advanced & Expert Users Deleting lines from a file Post 84057 by blowtorch on Wednesday 21st of September 2005 12:58:12 PM
Old 09-21-2005
Records are potentially very different from lines. You could have your own delimiters and have a record spanning several lines. If each line is a single record, then you could still run the following command under ksh:
Code:
sed -n "50000,200000p" file_to_cut_lines_from | cat > file_to_cut_lines_from

Though I really dont know if you can do this with such a large file. Even if it works, it will take a really long time to get through the file.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

deleting lines in a log file

Is there an easy way to delete the first so many lines in a log file? like I have a log file that has 10000 lines, i want to just get rid of the first 9000. (2 Replies)
Discussion started by: BG_JrAdmin
2 Replies

2. Shell Programming and Scripting

Deleting last 2 lines from the file.

Hi I have a file & always I need to remove or delete last 2 lines from that file. So in a file if I have 10 lines then it should return me first 8 lines. Can someone help me? (4 Replies)
Discussion started by: videsh77
4 Replies

3. Shell Programming and Scripting

Deleting lines in a file

How do I delete all the lines after the line containing text ***DISCLOSURES*** . I want to delete this line too. Thank you (2 Replies)
Discussion started by: reachsamir
2 Replies

4. UNIX for Dummies Questions & Answers

Deleting whole lines from a file

I have a file with 65 sets of 35 coordinates, and would like to isolate these coordinates so that I can easily copy the coordinates to another file. The problem is, I've got a 9 line header before each set of coordinates (so each set is 44 lines long). There are a zillion threads out there about... (3 Replies)
Discussion started by: red baron
3 Replies

5. Shell Programming and Scripting

Deleting lines ending with . from a file

HI I'm looking to delete lines ending with .tk from below data file --------- abc.tk mgm.tk dtk mgmstk ------ I have written below code ---- sed '/.tk *$/d' dat_file.txt > temp.txt ---- But its deleting all the lines ending with tk. I need to delete only the lines ending .tk my... (5 Replies)
Discussion started by: shekhar_v4
5 Replies

6. Shell Programming and Scripting

deleting lines from file

We have a server that logs transactions to a file. I want to write a script that will delete the first 50 lines of the file daily without renameing the file or moving the file. (8 Replies)
Discussion started by: daveisme
8 Replies

7. Shell Programming and Scripting

Deleting certain new lines from a file with shell

Good morning!!! Im a newbie with shell programing and i was wondering if there is a way to delete certain new lines from a file, here is an example of my current file: >seq_0 GTGAGATTGCTAATGAGCTGCTTTTAGGGGGCGTGTTGTGCTTGCTTTCC AACTTTTCTAGATTGATTCTACGCTGCCTCCAGCAGCCACCCCTCCCATC... (11 Replies)
Discussion started by: machalita
11 Replies

8. Shell Programming and Scripting

Re: Deleting lines from big file.

Hi, I have a big (2.7 GB) text file. Each lines has '|' saperator to saperate each columns. I want to delete those lines which has text like '|0|0|0|0|0' I tried: sed '/|0|0|0|0|0/d' test.txt Unfortunately, it scans the file but does nothing. file content sample:... (4 Replies)
Discussion started by: dipeshvshah
4 Replies

9. Shell Programming and Scripting

Deleting specific lines in a file

Hello, I have a file filled with dates, such as: 04-08-2011 message 04-08-2011 message 03-08-2011 message 01-08-2011 message 31-07-2011 message 24-07-2011 message 15-07-2011 message 13-12-2008 message 26-11-2007 message And I want to delete those lines whose date is older than 10... (5 Replies)
Discussion started by: asanchez
5 Replies

10. Shell Programming and Scripting

Deleting selected lines in a file

Hi Guys , I have two files say a1 and a2 having following contents a1 dag wfd a2 dag wfd chire hcm I want to delete only the lines in a2 which are in a1 and final output of a2 should be a2 chire hcm (6 Replies)
Discussion started by: Pradeep_1990
6 Replies
cat(1)							      General Commands Manual							    cat(1)

Name
       cat - concatenate and print data

Syntax
       cat [ -b ] [ -e ] [ -n ] [ -s ] [ -t ] [ -u ] [ -v ] file...

Description
       The  command reads each file in sequence and displays it on the standard output.  Therefore, to display the file on the standard output you
       type:
       cat file
       To concatenate two files and place the result on the third you type:
       cat file1 file2 > file3
       To concatenate two files and append them to a third you type:
       cat file1 file2 >> file3
       If no input file is given, or if a minus sign (-) is encountered as an argument, reads from the standard input file.  Output is buffered in
       1024-byte blocks unless the standard output is a terminal, in which case it is line buffered.  The utility supports the processing of 8-bit
       characters.

Options
       -b   Ignores blank lines and precedes each output line with its line number.

       -e   Displays a dollar sign ($) at the end of each output line.

       -n   Precedes all output lines (including blank lines) with line numbers.

       -s   Squeezes adjacent blank lines from output and single spaces output.

       -t   Displays non-printing characters (including tabs) in output.  In addition to those representations used with the -v  option,  all  tab
	    characters are displayed as ^I.

       -u   Unbuffers output.

       -v   Displays  non-printing  characters (excluding tabs and newline) as the ^x.	If the character is in the range octal 0177 to octal 0241,
	    it is displayed as M-x. The delete character (octal 0177) displays as ^?.  For example, is displayed as ^X.

See Also
       cp(1), ex(1), more(1), pr(1), tail(1)

																	    cat(1)
All times are GMT -4. The time now is 07:27 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy