11-28-2011
New to Unix command line and have a question about the "sort" command
I am going through the Unix Made Easy second edition book by John Muster. So far it's been very informative and I can tell it may be a bit out of date.
In one of the exercises it talks about the "sort" command and using it to sort column's of data etc. The "sort" command has changed a bit and it looks like the options using +0 OR +1 to sort by columns 1 and 2 are no longer used. These are replaced with the -k option.
I understand I can sort the first column of data in a file by using a command like "sort -k1 filename".
My question is how can I add in secondary and third columns to sort by to refine the information more? This is would be useful where you have letters or numbers that are the same and you want to add more criteria from other columns to sort the data.
In the book it talks about this and uses commands like "sort +2 -3 +1 -2 filename". How does this use work using -k because I have been unable to sort the data with the secondary options.
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
i have been trying to understand this chapter titled "Searching for Files and Text" for a few weeks now.
unfortunately, this chapter is one of those things, that no matter how hard you try and how long you try for, you are incapable of understanding (at least in my case)
this entire chapter,... (2 Replies)
Discussion started by: xyyz
2 Replies
2. UNIX for Dummies Questions & Answers
It seems our administrators had installed the version of the "sort" command not having the -M option. Does anyone have the source code for this routine?
I need to be able to sort on month comparison:
e.g. "sudo at -l | sort -k3M,5" (1 Reply)
Discussion started by: superdelic
1 Replies
3. UNIX for Dummies Questions & Answers
Hi All,
I am trying to schedule a one time job using the at command with the help of shell script for my project. The shell script should take a parameter as a command line argument from the at command itself. Is it possible to take a command line parameter for a shell script in the command... (3 Replies)
Discussion started by: Mohanraj
3 Replies
4. Shell Programming and Scripting
Hi
I want to display "echo command value in loop" in single line. My requirement is to show the input file (test_1.txt) like the output file (test_2.txt) given below.
Input file :test_1.txt
a1|b1|4|5
a1|b1|42|9
a2|b2|32|25
a1|b1|2|5
a3|b3|4|8
a2|b2|14|6
Output file:test_2.txt... (2 Replies)
Discussion started by: sakthifire
2 Replies
5. Solaris
Hello experts,
I am using SunFire T200.
When I start reading the mail with "mail" command it comes older mail first.
From MAILER-DAEMON Sat Mar 28 06:02:48 2009
Return-Path: <MAILER-DAEMON@emarn1>
Received: from localhost (localhost)
....
....
I want to see the most recent mail... (1 Reply)
Discussion started by: thepurple
1 Replies
6. Shell Programming and Scripting
I need to sort the following file by the rhdiskpower devices in the last column:
Total_MB Free_MB OS_MB Name Failgroup Library Label UDID Product Redund Path
1024 851 1024 OCRVOT1_0000 OCRVOT1_0000 System UNKNOWN ... (3 Replies)
Discussion started by: wjssj
3 Replies
7. Shell Programming and Scripting
Hi,
I have line in input file as below:
3G_CENTRAL;INDONESIA_(M)_TELKOMSEL;SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL
My expected output for line in the file must be :
"1-Radon1-cMOC_deg"|"LDIndex"|"3G_CENTRAL|INDONESIA_(M)_TELKOMSEL"|LAST|"SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL"
Can someone... (7 Replies)
Discussion started by: shis100
7 Replies
8. UNIX for Dummies Questions & Answers
I am trying to find lines in a text file larger than 3 Gb that start with a given string. My command looks like this:
$ look "string" "/home/patrick/filename.txt"
However, this gives me the following message:
"look: /home/patrick/filename.txt: File too large"
So, I have two... (14 Replies)
Discussion started by: shishong
14 Replies
9. Shell Programming and Scripting
Hello Everybody :) !!!. i have question in mind, is it possible to sort a list of hexadecimal numbers using "sort" command? (9 Replies)
Discussion started by: Kesavan
9 Replies
10. UNIX for Dummies Questions & Answers
How to use "mailx" command to do e-mail reading the input file containing email address, where column 1 has name and column 2 containing “To” e-mail address
and column 3 contains “cc” e-mail address to include with same email.
Sample input file, email.txt
Below is an sample code where... (2 Replies)
Discussion started by: asjaiswal
2 Replies
MREAD(1) General Commands Manual MREAD(1)
NAME
mread - low level read (copy) an MSDOS file to Unix
SYNOPSIS
mread [ -tnm ] msdosfile unixfile
mread [ -tnm ] msdosfile [ msdosfiles... ] unixdirectory
DESCRIPTION
In the first form, mread copies the specified MSDOS file to the named Unix file. The second form of the command copies multiple MSDOS
files to the named Unix directory.
Mread will allow the following command line options:
t Text file transfer. Mread will translate incoming carriage return/line feeds to line feeds.
n No warning. Mread will not warn the user when overwriting an existing file.
m Preserve the file modification times.
If the target file already exists, and the -n option is not in effect, mread asks whether or not to overwrite the file.
MSDOS subdirectory names are supported with either the '/' or '' separator. The use of the '' separator or wildcards will require the
names to be enclosed in quotes to protect them from the shell.
The mcd command may be used to establish the device and the current working directory (relative to MSDOS), otherwise the default is A:/.
SEE ALSO
mcd(1), mcopy(1), mtype(1), mwrite(1)
BUGS
Unlike MSDOS, the destination directory may not be omitted.
local MREAD(1)