05-02-2003
Which block of code are you referring to?
In the first one, we list all the files and the xargs program tells the shell to concatenate everything into one big file. Any messages that would display (such as cat: input/output files 'bigFile' identical if bigFile is in the same directory as the files being concatenated) are sent to /dev/null so you don't see anything on screen..
In the second one, cat takes two files -- bigFile and $fn -- and concatenates them together into TMP_00.. remember, that's the whole purpose of "cat"!
Last edited by oombera; 02-18-2004 at 10:35 PM..
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hello Everyone,
I am new to scripting and confused with how to do this efficiently. I am trying to use AWK to do this.
I have a lot of files in a folder which has the data of my throughput measurements in two columns i.e. Serial # and Throughput. like this
177.994 847.9
178.996 ... (1 Reply)
Discussion started by: hakim
1 Replies
2. UNIX for Dummies Questions & Answers
Hi all,
I am faced with a rather unusual problem regarding interaction between NT and UNIX. I am using an ETL (Extract-Transform-Load) tool on unix that has the capability to read .xls files. So, when I FTP an excel (.xls) file from a windows server to unix and attempt to read it with this... (3 Replies)
Discussion started by: ucode_2482
3 Replies
3. UNIX for Dummies Questions & Answers
Hi All,
I have four scripts to run.
My 1st script will make script2 and script3 to run. I am setting a cron job for this script1 to run continuously.
This script1 will check for 2 text files and based on the existance of those text files it will initiate the script2 and script3.
Now my doubt... (2 Replies)
Discussion started by: RSC1985
2 Replies
4. Shell Programming and Scripting
I have four scripts to run.
My 1st script will make script2 and script3 to run. I am setting a cron job for this script1 to run continuously.
This script1 will check for 2 text files and based on the existance of those text files it will initiate the script2 and script3.
Now my doubt is that... (2 Replies)
Discussion started by: RSC1985
2 Replies
5. Shell Programming and Scripting
I have five directories, dir1 to dir5
for each directory, I have all same number-named folders. There are four types of folders, {1..10}, {20..30}, { 40..50}, {60..70}
Now for each types of folder, I will do the same thing, here is the code
for i in {1..5}
do
cd dir$i
mkdir temp1
for... (5 Replies)
Discussion started by: ksgreen
5 Replies
6. Shell Programming and Scripting
hai i need my single awk script to act on 4 trace files of ns2 and to calculate througput and it should print result from each trace file in a single trace file. i tried with the following code but it doesnt work awk -f awkscript inputfile1 inputfile2 inputfile3 inputfile4>outputfile ... (4 Replies)
Discussion started by: sarathyy
4 Replies
7. Programming
Hello,
I extracted a list of files in a directory with the command ls . However this is not my computer, so the ls functionality has been revamped so that it gives the filesizes in front like this :
This is the output of ls command : I stored the output in a file filelist
1.1M... (5 Replies)
Discussion started by: ajayram
5 Replies
8. Shell Programming and Scripting
I'm completely brand new to bash scripting (migrating from Windows batch file scripting). I'm currently trying to write a bash script that will automatically reset "error-disabled" Cisco switch ports. Please forgive the very crude and inefficient script I have so far (shown below). It is... (10 Replies)
Discussion started by: MKANET
10 Replies
9. Shell Programming and Scripting
Hi ,
I want to process the below file and add rules for grouping based on key in unix shell script. For eg
Input file :
I have 3 columns and key column is group
Group status application
G1 Complete A1
G1 Delay A2
G2 Complete A3,A4
G3 Delay A5, A6... (8 Replies)
Discussion started by: ashishagg2005
8 Replies
10. Shell Programming and Scripting
Hello
I have a program cfxfrwb which is designed to remove headers from reports files.
The cfxfrwb is located in the following directory /u01/efin/v40/live/bin
I run the program against a single report file in the temp directory and it does it's job../cfxfrwb... (2 Replies)
Discussion started by: captainrhodes
2 Replies
cat(1) General Commands Manual cat(1)
Name
cat - concatenate and print data
Syntax
cat [ -b ] [ -e ] [ -n ] [ -s ] [ -t ] [ -u ] [ -v ] file...
Description
The command reads each file in sequence and displays it on the standard output. Therefore, to display the file on the standard output you
type:
cat file
To concatenate two files and place the result on the third you type:
cat file1 file2 > file3
To concatenate two files and append them to a third you type:
cat file1 file2 >> file3
If no input file is given, or if a minus sign (-) is encountered as an argument, reads from the standard input file. Output is buffered in
1024-byte blocks unless the standard output is a terminal, in which case it is line buffered. The utility supports the processing of 8-bit
characters.
Options
-b Ignores blank lines and precedes each output line with its line number.
-e Displays a dollar sign ($) at the end of each output line.
-n Precedes all output lines (including blank lines) with line numbers.
-s Squeezes adjacent blank lines from output and single spaces output.
-t Displays non-printing characters (including tabs) in output. In addition to those representations used with the -v option, all tab
characters are displayed as ^I.
-u Unbuffers output.
-v Displays non-printing characters (excluding tabs and newline) as the ^x. If the character is in the range octal 0177 to octal 0241,
it is displayed as M-x. The delete character (octal 0177) displays as ^?. For example, is displayed as ^X.
See Also
cp(1), ex(1), more(1), pr(1), tail(1)
cat(1)