07-31-2009
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hello,
A few days ago I created my amateur version of the cat function in bash. Here is what I've done:
#!/bin/bash
#This is mycat. Similar to cat.
#For detailed information use path/to/mycat.sh -h option
arguments=$#
if ] #in case of standard input
then
while ]
do
read input... (4 Replies)
Discussion started by: sanchopansa
4 Replies
2. Shell Programming and Scripting
Hi Everyone,
I have a file: a.txt
a,b,c,d,6,6,6
1,2,3,d,6,6,6
4,5,6,6,6,6,6
#!/usr/bin/perl
use warnings;
use strict;
my @array = ();
### Load file into array
for my $i (split '\n', `cat /tmp/a.txt`) {
push @array, ;
}
It works. But my a.txt have 1million lines, and... (2 Replies)
Discussion started by: jimmy_y
2 Replies
3. Shell Programming and Scripting
I am not sure if using cat -n is the most efficient way to split a file into multiple files, one file per line in the source file.
I thought using cat -n would make it easy to process the file because it produces an output that numbers each line that I could then grep for with the regex "^ *$i".... (3 Replies)
Discussion started by: kapu
3 Replies
4. Shell Programming and Scripting
Hello,
I'm new in Shell scripting but i should write a script, which inserts the license header out of a txt-File into the files in our Projekt. For the Java classes it runs without Problems but for XML files not. At xml-files i have to put the license Header after the xml-Header (?xml... (2 Replies)
Discussion started by: PhoenixONE
2 Replies
5. Shell Programming and Scripting
Hallo,
ich habe mir mit meinen dürftigen Programmierkenntnissen ein Script zusammengebastelt über das ich in einem bestimmten Odner mit AWK alle Dateien eines Verzeichnis durchsuche und bestimmte Bezeichungen aller Dateien ändern kann.
Es funktioniert auch soweit, nur hätte ich gerne auch die... (1 Reply)
Discussion started by: ruffi
1 Replies
6. Solaris
Hallo :-)
Ich habe da ein Problem beim Zugriff von Solaris mittels rdesktop auf eine TS Farm unter W2K8R2 mit NLB und Session Broker.
Ich bekomme folgende Fehlermeldung:
user@sunray2xxx /h/user/Desktop 150 > rdesktop terminalserver
WARNING: Remote desktop does not support colour... (1 Reply)
Discussion started by: chrischi1978
1 Replies
7. Shell Programming and Scripting
I have figured out how to grep the file like this:
echo `grep $(date +'%Y-%m-%d') Cos-01.csv | cut -d',' -f1`
The above line does echo the correct information from the lines in which my search criteria is found.
Now I am trying to get that information (Yes, just one column of every line) into... (6 Replies)
Discussion started by: TwelveDays
6 Replies
8. Shell Programming and Scripting
Hi,
Normally, I would do
cat /etc/oratab | grep -v "^#" | grep -v "^*" > /tmp/oratab.00
while read line
do
echo $line
done < /tmp/oratab.00I want to know whether it is possible to use an array instead of re-directing it to file?
As a test, I did something like below:
#!/bin/ksh
... (6 Replies)
Discussion started by: newbie_01
6 Replies
9. Shell Programming and Scripting
Trying to do some control flow parsing based on the index postion of an array member. Here is the pseudo code I am trying to write in (preferably in pure bash) where possible. I am thinking regex with do the trick, but need a little help.
pesudo code
if == ENDSINFIVEINTS ]]; then
do... (4 Replies)
Discussion started by: briandanielz
4 Replies
10. Shell Programming and Scripting
hello,
i need a bit of help on how to do this effectively in bash without a lot of extra looping or massive switch/case
i have a long array of M elements and a short array of N elements, so M > N always. M is not a multiple of N.
for case 1, I want to stretch N to fit M
arrayHuge
H = (... (2 Replies)
Discussion started by: f77hack
2 Replies
LEARN ABOUT DEBIAN
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)