Sponsored Content
Top Forums Shell Programming and Scripting How to delete first 5 lines and last five lines in all text files Post 302160050 by Rajesh Kumar on Sunday 20th of January 2008 09:03:21 AM
Old 01-20-2008
Ragavendran, see if this helps

team$ cat numbers
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
team$

team$ cat lines.sh
#!/usr/bin/ksh
echo "Enter No.of lines to remove from TOP : "
read top
echo "Enter No.of lines to remove from BOTTOM :"
read bottom

total=`wc -l < numbers`
endval=`expr $total - $bottom`
startval=`expr $top + 1`

echo "**** Showing lines $startval -- $endval **** \n"
sed -n ${startval},${endval}p $1
team$

team$ lines.sh numbers
Enter No.of lines to remove from TOP :
4
Enter No.of lines to remove from BOTTOM :
4
**** Showing lines 5 -- 11 ****

5
6
7
8
9
10
11
team$

put it in for loop to process all the files . Smilie
 

10 More Discussions You Might Find Interesting

1. Programming

Delete specific lines in a text file

Hi, experts, I would like to create a function that can calculate the total number of lines in a saved text file and delete specific lines in that particular file (I only want the last few lines). Hav anybody have the experience and giv me a hand in this? (9 Replies)
Discussion started by: dniz
9 Replies

2. Shell Programming and Scripting

Delete lines containing text with sed

hello all I have bunch of files containing lines of text that surrounding by <# .......#> tags I like to delete this lines from the text files whiteout open the files , can it be done with sed ? or other unix tool (perl mybe )? (2 Replies)
Discussion started by: umen
2 Replies

3. Shell Programming and Scripting

Delete blocks of lines from text file

Hello, Hello Firends, I have file like below. I want to remove selected blocks say abc,pqr,lst. how can i remove those blocks from file. zone abc { blah blah blah } zone xyz { blah blah blah } zone pqr { blah blah blah } (4 Replies)
Discussion started by: nrbhole
4 Replies

4. UNIX for Dummies Questions & Answers

Delete vertical lines in an text file

Hi everybody! I need to delete several vertical lines in a huge text file. It should work like the example below. Delete the vertical lines 2 and 8. 123456789 masldfjla afsajfwel sajfljsaf safsarfrl sajfeljwq 1345679 msldfja asajfwl sjfljsf sfsarfl sjfeljq Is there a... (11 Replies)
Discussion started by: relaxo
11 Replies

5. Shell Programming and Scripting

looking for a script that will delete lines in a text file

it will grep for a line and then delete these line. how do i begin to write this script if theres no available one? (3 Replies)
Discussion started by: garfish
3 Replies

6. Shell Programming and Scripting

need to delete all lines from a group of files except the 1st 2 lines

Hello, I have a group of text files with many lines in each file. I need to delete all the lines in each and only leave 2 lines in each file. (3 Replies)
Discussion started by: script_op2a
3 Replies

7. Shell Programming and Scripting

How to delete lines from text file?

hi guys, I have very large txt files (200GB) and just want to to delete the first two lines (headers). So far I used sed -i '1,2d' infile.txtbut this command always takes extremely long as it writes all again. Is there a better way to do it (ie just to delete the lines without writing all... (2 Replies)
Discussion started by: TuAd
2 Replies

8. Shell Programming and Scripting

search and replace, when found, delete multiple lines, add new set of lines?

hey guys, I tried searching but most 'search and replace' questions are related to one liners. Say I have a file to be replaced that has the following: $ cat testing.txt TESTING AAA BBB CCC DDD EEE FFF GGG HHH ENDTESTING This is the input file: (3 Replies)
Discussion started by: DeuceLee
3 Replies

9. Shell Programming and Scripting

Sed/awk to delete single lines that aren't touching other lines

Hello, I'm trying to figure out how to use sed or awk to delete single lines in a file. By single, I mean lines that are not touching any other lines (just one line with white space above and below). Example: one two three four five six seven eight I want it to look like: (6 Replies)
Discussion started by: slimjbe
6 Replies

10. Shell Programming and Scripting

Delete lines above and below specific line of text

I'm trying to remove a specific number of lines, above and below a specific line of text, highlighted in red: <STMTTRN> <TRNTYPE>CREDIT <DTPOSTED>20151205000001 <TRNAMT>10 <FITID>667800001 <CHECKNUM>667800001 <MEMO>BALANCE </STMTTRN> <STMTTRN> <TRNTYPE>DEBIT <DTPOSTED>20151207000001... (8 Replies)
Discussion started by: bomsom
8 Replies
CAT(1)							      General Commands Manual							    CAT(1)

NAME
cat - catenate and print SYNOPSIS
cat [ -u ] [ -n ] [ -s ] [ -v ] file ... DESCRIPTION
Cat reads each file in sequence and displays it on the standard output. Thus cat file displays the file on the standard output, and cat file1 file2 >file3 concatenates the first two files and places the result on the third. If no input file is given, or if the argument `-' is encountered, cat reads from the standard input file. Output is buffered in the block size recommended by stat(2) unless the standard output is a terminal, when it is line buffered. The -u option makes the output completely unbuffered. The -n option displays the output lines preceded by lines numbers, numbered sequentially from 1. Specifying the -b option with the -n option omits the line numbers from blank lines. The -s option crushes out multiple adjacent empty lines so that the output is displayed single spaced. The -v option displays non-printing characters so that they are visible. Control characters print like ^X for control-x; the delete char- acter (octal 0177) prints as ^?. Non-ascii characters (with the high bit set) are printed as M- (for meta) followed by the character of the low 7 bits. A -e option may be given with the -v option, which displays a `$' character at the end of each line. Specifying the -t option with the -v option displays tab characters as ^I. SEE ALSO
cp(1), ex(1), more(1), pr(1), tail(1) BUGS
Beware of `cat a b >a' and `cat a b >b', which destroy the input files before reading them. 4th Berkeley Distribution May 5, 1986 CAT(1)
All times are GMT -4. The time now is 11:43 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy