02-09-2010
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I am writing a script that is running a loop on one file to obtain records from another file.
Using egrep, I am finding matching records in file b, then outputing feilds of both into another file.
****************************
filea=this.txt
fileb=that.txt
cat $filea | while read line
do... (1 Reply)
Discussion started by: djsal
1 Replies
2. Shell Programming and Scripting
Hello,
So I sorted my file as I was supposed to:
sort -n -r -k 2 -k 1 file1 | uniq > file2
and when I wrote
> cat file2
in the command line, I got what I was expecting, but in the script itself
...
sort -n -r -k 2 -k 1 averages | uniq > temp
cat file2
It wrote a whole... (21 Replies)
Discussion started by: shira
21 Replies
3. UNIX for Dummies Questions & Answers
Hi--
I'm trying to figure out how to use cat more wisely. I have the following command, which works, but I'd like to understand how to get it to work more clearly and efficiently.
cat 'my file.001' 'my file.002' 'my file.003' 'my file.004' 'my file.005' 'my file.006' 'my file.007' 'my... (6 Replies)
Discussion started by: rlinsurf
6 Replies
4. Shell Programming and Scripting
Hello!
I have one strange question - let's say I have a long, multiple-line string displayed on the terminal using echo, and I would like to make a carriage return to the beginning of this string, no to the beginning of the last line - is something like that possible? I would like to be able to... (1 Reply)
Discussion started by: xqwzts
1 Replies
5. UNIX Desktop Questions & Answers
I have a number of files in a directory named like this:
fooP1, fooN1, fooP2, fooN2 ... fooP(i), fooN(i).
I'd like to know how to combine each P and N pair into a single file, foo(i)
TIA
John Balwit (1 Reply)
Discussion started by: balwit
1 Replies
6. Shell Programming and Scripting
Hi everyone,
I'm new to the forums, as you can probably tell... I'm also pretty new to scripting and writing any type of code.
I needed to know exactly how I can grep for multiple strings, in files located in one directory, but I need each string to output to a separate file.
So I'd... (19 Replies)
Discussion started by: LDHB2012
19 Replies
7. UNIX for Dummies Questions & Answers
I have a folder that contains a number of files with file names as follows:
XX.YYYY..ZZZ.2014.001.000000
XX.YYYY..ZZZ.2014.001.000400
XX.YYYY..ZZZ.2014.001.000800
XX.YYYY..ZZZ.2014.001.001200
XX.YYYY..ZZZ.2014.001.001600
.....
XX.YYYY..ZZZ.2014.002.000000
XX.YYYY..ZZZ.2014.002.000400... (8 Replies)
Discussion started by: quakesrus
8 Replies
8. UNIX for Dummies Questions & Answers
Hi,
Is there any way to do a cat * where it shows the name of each file in the process? Similar to what more does below?
$ more ?.sql
::::::::::::::
1.sql
::::::::::::::
set linesize 200
select db_unique_name,
cast(
from_tz(
cast(... (5 Replies)
Discussion started by: newbie_01
5 Replies
9. Shell Programming and Scripting
I am looking for help in processing of those options: '-n' or '-p'
I understand what they do and how to use them.
But, I would like to use them with more than one file (and without any shell-loop; loading the 'perl' once.)
I did try it and -n works on 2 files.
Question is:
- is it possible to... (6 Replies)
Discussion started by: alex_5161
6 Replies
10. UNIX for Beginners Questions & Answers
Hello All!
Thanks for taking time out and helping.
My issue is, I have two files that have file names in it. Now, i need to go through each line of both the files and when the file names are different, i need to rename the file. Below is the example:
File1</
fil1ename1.txt
filename2,txt... (2 Replies)
Discussion started by: svks1985
2 Replies
CAT(1) BSD General Commands Manual CAT(1)
NAME
cat -- concatenate and print files
SYNOPSIS
cat [-benstuv] [file ...]
DESCRIPTION
The cat utility reads files sequentially, writing them to the standard output. The file operands are processed in command-line order. If
file is a single dash ('-') or absent, cat reads from the standard input. If file is a UNIX domain socket, cat connects to it and then reads
it until EOF. This complements the UNIX domain binding capability available in inetd(8).
The options are as follows:
-b Number the non-blank output lines, starting at 1.
-e Display non-printing characters (see the -v option), and display a dollar sign ('$') at the end of each line.
-n Number the output lines, starting at 1.
-s Squeeze multiple adjacent empty lines, causing the output to be single spaced.
-t Display non-printing characters (see the -v option), and display tab characters as '^I'.
-u Disable output buffering.
-v Display non-printing characters so they are visible. Control characters print as '^X' for control-X; the delete character (octal
0177) prints as '^?'. Non-ASCII characters (with the high bit set) are printed as 'M-' (for meta) followed by the character for the
low 7 bits.
EXIT STATUS
The cat utility exits 0 on success, and >0 if an error occurs.
EXAMPLES
The command:
cat file1
will print the contents of file1 to the standard output.
The command:
cat file1 file2 > file3
will sequentially print the contents of file1 and file2 to the file file3, truncating file3 if it already exists. See the manual page for
your shell (i.e., sh(1)) for more information on redirection.
The command:
cat file1 - file2 - file3
will print the contents of file1, print data it receives from the standard input until it receives an EOF ('^D') character, print the con-
tents of file2, read and output contents of the standard input again, then finally output the contents of file3. Note that if the standard
input referred to a file, the second dash on the command-line would have no effect, since the entire contents of the file would have already
been read and printed by cat when it encountered the first '-' operand.
SEE ALSO
head(1), more(1), pr(1), sh(1), tail(1), vis(1), zcat(1), setbuf(3)
Rob Pike, "UNIX Style, or cat -v Considered Harmful", USENIX Summer Conference Proceedings, 1983.
STANDARDS
The cat utility is compliant with the IEEE Std 1003.2-1992 (``POSIX.2'') specification.
The flags [-benstv] are extensions to the specification.
HISTORY
A cat utility appeared in Version 1 AT&T UNIX. Dennis Ritchie designed and wrote the first man page. It appears to have been cat(1).
BUGS
Because of the shell language mechanism used to perform output redirection, the command ``cat file1 file2 > file1'' will cause the original
data in file1 to be destroyed!
The cat utility does not recognize multibyte characters when the -t or -v option is in effect.
BSD
March 21, 2004 BSD