Sponsored Content
Top Forums Shell Programming and Scripting write specific line number in file Post 302624131 by Chubler_XL on Sunday 15th of April 2012 11:59:31 PM
Old 04-16-2012
Try:

Code:
sed -i '1i#!/bin/bash' testing.sh

This User Gave Thanks to Chubler_XL For This Post:
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Adding a columnfrom a specifit line number to a specific line number

Hi, I have a huge file & I want to add a specific text in column. But I want to add this text from a specific line number to a specific line number & another text in to another range of line numbers. To be more specific: lets say my file has 1000 lines & 4 Columns. I want to add text "Hello"... (2 Replies)
Discussion started by: Ezy
2 Replies

2. Shell Programming and Scripting

extract the lines between specific line number from a text file

Hi I want to extract certain text between two line numbers like 23234234324 and 54446655567567 How do I do this with a simple sed or awk command? Thank you. ---------- Post updated at 06:16 PM ---------- Previous update was at 05:55 PM ---------- found it: sed -n '#1,#2p'... (1 Reply)
Discussion started by: return_user
1 Replies

3. Shell Programming and Scripting

using sed to replace a specific string on a specific line number using variables

using sed to replace a specific string on a specific line number using variables this is where i am at grep -v WARNING output | grep -v spawn | grep -v Passphrase | grep -v Authentication | grep -v '/sbin/tfadmin netguard -C'| grep -v 'NETWORK>' >> output.clean grep -n Destination... (2 Replies)
Discussion started by: todd.cutting
2 Replies

4. Shell Programming and Scripting

How would i delete a line at specific line number

Hi guys , I m writing a script to delete a line at particular location. But i m unable to use variable for specifying line number. for example. sed -n '7!p' filename works fine and deletes 7th line from my file but sed -n '$variable!p' filename gives following error. sed: -e... (12 Replies)
Discussion started by: pinga123
12 Replies

5. Linux

Get a specific line number from a text file

Hello! All, Could you please tell me how to get a specific line number from a text file? For example below, ABC DEF ---> Get this line number, return to an variable GHI My OS is Linux. Thank you so much for your help in advance! (3 Replies)
Discussion started by: barryxian
3 Replies

6. Shell Programming and Scripting

how read specific line in a file and write it in a new text file?

I have list of files in a directory 'dir'. Each file is of type HTML. I need to read each file and get the string which starts with 'http' and write them in a new text file. How can i do this shell scripting? file1.html <head> <url>http://www.google.com</url> </head> file2.html <head>... (6 Replies)
Discussion started by: vel4ever
6 Replies

7. Shell Programming and Scripting

Write $line number into textfile and read from line number

Hello everyone, I don't really know anything about scripting, but I have to manage to make this script, out of necessity. #!/bin/bash while read -r line; do #I'm reading from a big wordlist instructions using $line done Is there a way to automatically write the $line number the script... (4 Replies)
Discussion started by: bobylapointe
4 Replies

8. Shell Programming and Scripting

Cut from specific line number to a line number

Hi All, I've a file like this.. Sheet1 a,1 a,2 a,3 a,4 a,5 Sheet2 a,6 a,7 a,8 a,9 a,10 Sheet3 a,11 a,12 a,13 (7 Replies)
Discussion started by: manab86
7 Replies

9. Shell Programming and Scripting

sed command to replace a line at a specific line number with some other line

my requirement is, consider a file output cat output blah sdjfhjkd jsdfhjksdh sdfs 23423 sdfsdf sdf"sdfsdf"sdfsdf"""""dsf hellow there this doesnt look good et cetc etc etcetera i want to replace a line of line number 4 ("this doesnt look good") with some other line ... (3 Replies)
Discussion started by: vivek d r
3 Replies

10. Shell Programming and Scripting

Grep pattern after specific line number in a file

Hi guys, I am running a while loop in a script ro read a file line by line. Now I want to run a grep only on the lines below the line I am that is being read by the while loop. Eg: If my while loop is on line 4 of the file, the grep only runs below line 4 and does not include line 1,2... (3 Replies)
Discussion started by: Junaid Subhani
3 Replies
SYSTEM(3)						     Linux Programmer's Manual							 SYSTEM(3)

NAME
system - execute a shell command SYNOPSIS
#include <stdlib.h> int system(const char *string); DESCRIPTION
system() executes a command specified in string by calling /bin/sh -c string, and returns after the command has been completed. During execution of the command, SIGCHLD will be blocked, and SIGINT and SIGQUIT will be ignored. RETURN VALUE
The value returned is -1 on error (e.g. fork failed), and the return status of the command otherwise. This latter return status is in the format specified in wait(2). Thus, the exit code of the command will be WEXITSTATUS(status). In case /bin/sh could not be executed, the exit status will be that of a command that does exit(127). If the value of string is NULL, system() returns nonzero if the shell is available, and zero if not. system() does not affect the wait status of any other children. CONFORMING TO
ANSI C, POSIX.2, BSD 4.3 NOTES
As mentioned, system() ignores SIGINT and SIGQUIT. This may make programs that call it from a loop uninterruptable, unless they take care themselves to check the exit status of the child. E.g. while(something) { int ret = system("foo"); if (WIFSIGNALED(ret) && (WTERMSIG(ret) == SIGINT || WTERMSIG(ret) == SIGQUIT)) break; } Do not use system() from a program with suid or sgid privileges, because strange values for some environment variables might be used to subvert system integrity. Use the exec(3) family of functions instead, but not execlp(3) or execvp(3). system() will not, in fact, work properly from programs with suid or sgid privileges on systems on which /bin/sh is bash version 2, since bash 2 drops privileges on startup. (Debian uses a modified bash which does not do this when invoked as sh.) The check for the availability of /bin/sh is not actually performed; it is always assumed to be available. ISO C specifies the check, but POSIX.2 specifies that the return shall always be non-zero, since a system without the shell is not conforming, and it is this that is implemented. It is possible for the shell command to return 127, so that code is not a sure indication that the execve() call failed. SEE ALSO
sh(1), signal(2), wait(2), exec(3) 2001-09-23 SYSTEM(3)
All times are GMT -4. The time now is 06:52 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy