12-15-2010
Thank you guys for the amazing replies. They work.
I am going to go ahead and use zaxxon's way, as it kind of fits in what i actually want to do (this was just a snippet of what i actually intend to do), so special thanks to him
Thank You DGPickett as well.
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi,
I need to append string "Hi" to the beginning of the lines containing some specific string. How can I achieve that?
Please help.
Malay (1 Reply)
Discussion started by: malaymaru
1 Replies
2. Shell Programming and Scripting
Hello,
If I run a program from within shell, the output is displayed in the command line terminal. Is there a way I can capture that output and choose only the very last string in it to send it to a new file?
Thank you (6 Replies)
Discussion started by: Lorna
6 Replies
3. UNIX for Dummies Questions & Answers
Hi, I'm trying to output all text from the first paragraph in a file that contains a specific string through the last paragraph in that file that contains that string.
Previously, I was outputting just each paragraph with that search string with:
cat in_file | nawk '{RS=""; FS="\n";... (2 Replies)
Discussion started by: carpenn
2 Replies
4. Shell Programming and Scripting
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 and add/replace... (1 Reply)
Discussion started by: suryanarayana
1 Replies
5. Shell Programming and Scripting
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
6. Shell Programming and Scripting
Hi all,
My file :test.txt just like this:
...........................
From: 333:123<sip:88888888888@bbbb.com
To: <sip:123456@aaaaa.com
.........................
I want a script to capture the string between sip: & @
Expect output:
88888888888
123456
Please help! (4 Replies)
Discussion started by: Alex Li
4 Replies
7. Shell Programming and Scripting
Dear All
From below mention input file I want op file as mention. Kindly help.
IP file:
"BSCGNR4_IPA17_C" 329 140119 0717 RXOCF-105 KJO001_BASC_NG AC FAULTY DG ON DOOR OPEN
Needed OP:
140119 0717 KJO001_BASC_NG AC FAULTY DG ON DOOR OPEN
Note that string mark in red as variable in... (3 Replies)
Discussion started by: jaydeep_sadaria
3 Replies
8. Shell Programming and Scripting
Dear all,
I have a log file to be analysed. this log file contains vaiours lines of code starting with date timestamp.
if my search string is exception then that resepective log statement starting from the date is required.
example:
2014/10/01 16:14:44.459|>=|E|X|19202496|2832|... (5 Replies)
Discussion started by: shravee
5 Replies
9. Shell Programming and Scripting
Hi guys,
I have a text file named file1.txt that is formatted like this:
001 , ID , 20000
002 , Name , Brandon
003 , Phone_Number , 616-234-1999
004 , SSNumber , 234-23-234
005 , Model , Toyota
007 , Engine ,V8
008 , GPS , OFF
and I have file2.txt formatted like this:
... (2 Replies)
Discussion started by: An0mander
2 Replies
10. UNIX for Beginners Questions & Answers
I want to search a small string in a large string and find the locations of the string. For this I used grep "string" -ob <file name where the large string is stored>. Now this gives me the locations of that string. Now how do I store these locations in a text file.
Please use CODE tags as... (7 Replies)
Discussion started by: ANKIT ROY
7 Replies
LEARN ABOUT CENTOS
sd_readahead
SD_READAHEAD(3) sd_readahead SD_READAHEAD(3)
NAME
sd_readahead - Control ongoing disk boot-time read-ahead operations
SYNOPSIS
#include "sd-readahead.h"
int sd_readahead(const char *action);
DESCRIPTION
sd_readahead() may be called by programs involved with early boot-up to control ongoing boot-time disk read-ahead operations. It may be
used to terminate read-ahead operations in case an uncommon disk access pattern is to be expected and hence read-ahead replay or collection
is unlikely to have the desired speed-up effect on the current or future boot-ups.
The action should be one of the following strings:
cancel
Terminates read-ahead data collection, and drops all read-ahead data collected during this boot-up.
done
Terminates read-ahead data collection, but keeps all read-ahead data collected during this boot-up around for use during subsequent
boot-ups.
noreplay
Terminates read-ahead replay.
RETURN VALUE
On failure, these calls return a negative errno-style error code. It is generally recommended to ignore the return value of this call.
NOTES
This function is provided by the reference implementation of APIs for controlling boot-time read-ahead and distributed with the systemd
package. The algorithm it implements is simple, and can easily be reimplemented in daemons if it is important to support this interface
without using the reference implementation.
Internally, this function creates a file in /run/systemd/readahead/ which is then used as flag file to notify the read-ahead subsystem.
For details about the algorithm check the liberally licensed reference implementation sources:
http://cgit.freedesktop.org/systemd/systemd/plain/src/readahead/sd-readahead.c and
http://cgit.freedesktop.org/systemd/systemd/plain/src/systemd/sd-readahead.h
sd_readahead() is implemented in the reference implementation's drop-in sd-readahead.c and sd-readahead.h files. It is recommended that
applications consuming this API copy the implementation into their source tree. For more details about the reference implementation, see
sd-readahead(3)
If -DDISABLE_SYSTEMD is set during compilation, this function will always return 0 and otherwise become a NOP.
EXAMPLES
Example 1. Cancelling all read-ahead operations
During boots where SELinux has to relabel the file system hierarchy, it will create a large amount of disk accesses that are not necessary
during normal boots. Hence it is a good idea to disable both read-ahead replay and read-ahead collection.
sd_readahead("cancel");
sd_readahead("noreplay");
SEE ALSO
systemd(1), sd-readahead(3), daemon(7)
systemd 208 SD_READAHEAD(3)