01-04-2007
Use 'sort -u' if your file isn't already sorted.
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I have a flat file and need to count no of records in the file less the header and the trailer record.
I would appreciate any and all asistance
Thanks
Hadi Lalani (2 Replies)
Discussion started by: guiguy
2 Replies
2. Shell Programming and Scripting
Hi All,
I have two files say file1 and file2.
I want to check the number of records in file1 and if its atleast 2 (i.e., 2 or greater than 2 ) then I have to check records in file2 .If records in file2 is atleast 1 (i.e. if its not empty ) i have to set some conditions .
Could you pls... (3 Replies)
Discussion started by: mavesum
3 Replies
3. Shell Programming and Scripting
Hi,
I have a huge file say with 2000000 records. The file has 42 fields. I would like to pick randomly 1000 records from this huge file. Can anyone help me how to do this? (1 Reply)
Discussion started by: ajithshankar@ho
1 Replies
4. UNIX for Dummies Questions & Answers
Hi everyone.
I am a newbie to Linux stuff. I have this kind of problem which couldn't solve alone. I have a text file with records separated by empty lines like this:
ID: 20
Name: X
Age: 19
ID: 21
Name: Z
ID: 22
Email: xxx@yahoo.com
Name: Y
Age: 19
I want to grep records that... (4 Replies)
Discussion started by: Atrisa
4 Replies
5. Web Development
Hi all,
I have an interesting and I am sure simple question for yau'll.
Basically this is what I am after:
The table:
CREATE TABLE places (id INT, city VARCHAR(24), name VARCHAR(24));
The data:
id = 1, city = canberra, name = aaron
id = 2, city = canberra, name = andrew
id = 3, city... (4 Replies)
Discussion started by: STOIE
4 Replies
6. UNIX for Dummies Questions & Answers
Hello,
I have a file which looks like:
%_SPE_RDP_NUM_ECH(7)*************%
%_SPE_RDP_NUM_ECH(70)************%
%_SPE_RDP_NUM_ECH(71)************%
%_SPE_RDP_NUM_ECH(72)************%
%_SPE_RDP_NUM_ECH(8)*************%
%_SPE_RDP_NUM_ECH(9)*************%
%_SPE_FLUXPREV_PRES1_MT_HT(2)****%... (5 Replies)
Discussion started by: mvalonso
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7. Shell Programming and Scripting
From the below ps output , I want the distinct values of the third field (ie. I need the distinct PPIDs)
$ ps -ef
UID PID PPID C STIME TTY TIME CMD
root 1 0 0 Nov 10 - 48:49 /etc/init
root 1769576 1 0 Nov 10 - 0:07... (1 Reply)
Discussion started by: polavan
1 Replies
8. Shell Programming and Scripting
Hi Freinds ,
I have 2 files .
File 1
|nag|HYd|1|Che
|esw|Gun|2|hyd
|pra|bhe|3|hyd
|omu|hei|4|bnsj
|uer|oeri|5|uery
File 2
|nag|HYd|1|Che
|esw|Gun|2|hyd
|uer|oi|3|uery
output : (9 Replies)
Discussion started by: i150371485
9 Replies
9. Shell Programming and Scripting
Red Hat Enterprise Linux 5.4
I have a text file (error log file) , which has occurences of an error message like
ORA-01652: unable to extend temp segment by 8 in tablespace xxxxxThere are around 3000 error messages like this in the error log file. But there are only 7 or 8 distinct... (3 Replies)
Discussion started by: John K
3 Replies
10. Shell Programming and Scripting
Hi I am new to shell programming in unix
Please if I can provide help.
I have a file structure of a header record and "N" detail records.
The header record will be the total number of detail records
I need to split the file in 2:
One for the header
Another for all detail records
Could... (1 Reply)
Discussion started by: jamcogar
1 Replies
LEARN ABOUT X11R4
readahead
readahead(8) System Manager's Manual readahead(8)
NAME
readahead - file preloader for boot process optimization
SYNOPSIS
readahead [options] <file-list> [another-file-list [...]]
DESCRIPTION
readahead is a files preloader designed to optimize the disk I/O during the boot process.
OPTIONS
-b, --build
build optimised files list only, without sorting.
-s, --sort
build and sort list of files only (implies -b).
-o, --output <file>
write sorted list of files to file.
-d, --dont-sort
preload files described by an already sorted files list.
-h, --help
print the usage information.
-v, --verbose
enable the verbose mode.
-t, --timing
report time spent on each operation.
-m, --maxsize <max size>
maximum size in KiB a file can be in order to be preloaded, default is 10240.
<file-list> [another-file-list [...]]
One or more files containing the list of files to be preloaded or sorted. The files list can be generated by readahead-collector(8).
FILES
/etc/default/readahead-fedora
SEE ALSO
readahead-collector(8), readahead(2),
AUTHORS
Arjan van de Ven <arjan@infradead.org>,
Ziga Mahkovec <ziga.mahkovec@klika.si>, Karel Zak <kzak@redhat.com>,
This manual page was written by Raphael Geissert <geissert@debian.org>
July 2011 readahead(8)