09-23-2009
cat $(ls | grep '[0-9].csv' ) will this work ... or you need one command only ? Ignoring anything char ..
9 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi Experts,
I am finding the performance of cat command is very wierd, it is taking more time to merge the files into a single file. We have a situation where we would be merging more than 100 files into a single file, but with cat command it is running slow. I tried doing with paste, join... (13 Replies)
Discussion started by: RcR
13 Replies
2. UNIX for Dummies Questions & Answers
Hi
Can anybody tell the difference between Difference between cat , cat > , cat >> and touch command in UNIX?
Thanks (6 Replies)
Discussion started by: skyineyes
6 Replies
3. Shell Programming and Scripting
cat myname.txt
John Doe I
John Doe II
John Doe III
-----------------------------------------------------------------------
for i in `cat myname.txt`
do
echo This is my name: $i >> thi.is.my.name.txt
done
-----------------------------------------------------------------------
cat... (1 Reply)
Discussion started by: danimad
1 Replies
4. 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
5. Shell Programming and Scripting
ok..
so problem is:
I have a file that reads:
cat 123
1 and 2
3 and 4
5 and 6
I was using for loops to run through this information.
Code:
for i in `cat 123`
do
echo $i
done
shouldn't the output come as
1 and 2 (3 Replies)
Discussion started by: foal_11
3 Replies
6. Shell Programming and Scripting
We have shell script (in ksh) which reads the records from a csv file line by line and does some operation. We have below command to read the file (CSV has the absolute path of files stored on a server something like SER/IMP/TEST/2010/12/123465.1).
P_FILES=`cat $P_BATCH_FILE`
for i in $P_FILES... (2 Replies)
Discussion started by: shreevatsau
2 Replies
7. Shell Programming and Scripting
I have a script to do a couple simple but repetitive commands on files that are provided to us. One of the things is to get rid of the line feeds. This is the section that is causing problems, i even cut this section into its own file to make sure nothing else was affecting it.
#!/usr/bin/bash... (4 Replies)
Discussion started by: oly_r
4 Replies
8. Shell Programming and Scripting
Hi,
I need to ssh remotely to a machine and cat a file assign the value to a variable
Script:
#!/bin/bash -x
value=`cat config.txt`
echo "$value"
ssh me@xxx.host.com "valu='cat /export/home/test.md5'; echo "$valu"" | tee
Execution:
$ ./x
++ cat config.txt
+ value='touch me'
+... (5 Replies)
Discussion started by: close2jay
5 Replies
9. UNIX for Beginners Questions & Answers
Good day to all,
I'd like to ask for your advice with regards to this.
Scenario :
I have here a file named TEST.tmp wherein the value inside is below;
"ONE|TWO|FIVE|THREE|FOUR|SIX~SEVEN~EIGHT" "NINE"
But when I'm trying to use this in a simple command like;
for TESTING in $(cat... (4 Replies)
Discussion started by: asdfghjkl
4 Replies
LEARN ABOUT LINUX
unbuffer
UNBUFFER(1) General Commands Manual UNBUFFER(1)
NAME
unbuffer - unbuffer output
SYNOPSIS
unbuffer program [ args ]
INTRODUCTION
unbuffer disables the output buffering that occurs when program output is redirected from non-interactive programs. For example, suppose
you are watching the output from a fifo by running it through od and then more.
od -c /tmp/fifo | more
You will not see anything until a full page of output has been produced.
You can disable this automatic buffering as follows:
unbuffer od -c /tmp/fifo | more
Normally, unbuffer does not read from stdin. This simplifies use of unbuffer in some situations. To use unbuffer in a pipeline, use the
-p flag. Example:
process1 | unbuffer -p process2 | process3
CAVEATS
unbuffer -p may appear to work incorrectly if a process feeding input to unbuffer exits. Consider:
process1 | unbuffer -p process2 | process3
If process1 exits, process2 may not yet have finished. It is impossible for unbuffer to know long to wait for process2 and process2 may
not ever finish, for example, if it is a filter. For expediency, unbuffer simply exits when it encounters an EOF from either its input or
process2.
In order to have a version of unbuffer that worked in all situations, an oracle would be necessary. If you want an application-specific
solution, workarounds or hand-coded Expect may be more suitable. For example, the following example shows how to allow grep to finish pro-
cessing when the cat before it finishes first. Using cat to feed grep would never require unbuffer in real life. It is merely a place-
holder for some imaginary process that may or may not finish. Similarly, the final cat at the end of the pipeline is also a placeholder
for another process.
$ cat /tmp/abcdef.log | grep abc | cat
abcdef
xxxabc defxxx
$ cat /tmp/abcdef.log | unbuffer grep abc | cat
$ (cat /tmp/abcdef.log ; sleep 1) | unbuffer grep abc | cat
abcdef
xxxabc defxxx
$
BUGS
The man page is longer than the program.
SEE ALSO
"Exploring Expect: A Tcl-Based Toolkit for Automating Interactive Programs" by Don Libes, O'Reilly and Associates, January 1995.
AUTHOR
Don Libes, National Institute of Standards and Technology
1 June 1994 UNBUFFER(1)