I don't see why you're performing cat on a directory. Is this a typo? If not, you will not get your intended results. Also, you can grep directly on the file instead of piping the cat output to grep. Read this "useless use of cat".
I'm trying to use unison from bash on windows with cygwin. I don't know if this is a cygwin question, bash question or unison question. Since I always get reprimanded by the cygwin mailing list for assuming it is a cygwin problem, I'll assume it is a bash question.
The following commands work... (7 Replies)
Hello,
So my knowledge of bash scripting is not that great and I have been trying to solve this problem on my own for awhile to no avail.
Here's the error I get when running it with an OS that uses bash 3.2.x:
testagain.sh: line 10: *-1: syntax error: operand expected (error token is... (2 Replies)
Halo,
Bash Script can get the time of process the trasaction or not?
For example, bash script use to procee the trasaction, like select and checking.. then generate the XML. after it, i need to get the time which to count the process.
Anyone can help me?
Thank you (1 Reply)
Hi
I have an ftp script which works fine when i execute through a test scheduler(UC4), but when i run it through the prod scheduler(UC4), it hungs indefinetely, when we cancel the job and re-run it it works perfectly fine. here is the code,, any idea why this is happening ????
... (1 Reply)
HI,
I have a file serverlist in that all host names are placed.
i have written a small script
#./testping
#! /bin/bash
for i in `cat serverlist`
do
ping $i >> output.txt
done
so now it creates a file output.txt till here fine..
now each time i run this script the output file... (4 Replies)
Hello,
i have cronjob:
crontab -l
* * * * * pkill -f domexpcheck;sh /root/dom/domexpcheck.sh
it runs:
/var/log/cron
Mar 25 12:11:01 vps crond: (root) CMD (pkill -f domexpcheck;sh /root/dom/domexpcheck.sh)
but somehow script dont run properly via cronjob. But when i execute cronjob... (7 Replies)
Hello,
I have a database file, named data.txt, and a shell script (convert.sh) to convert data.txt from columns to row. Output file name will be column_to_row.txt
In this example data.txt has only four rows.
Format of data.txt is:
info name surname telefon_nr
Data.txt
info boris... (1 Reply)
Hi, I've got a Bash backup script I'm trying to run on a directory via a cron job nightly. If I ssh in and run the script manually it works flawlessly. If I set up the cron to run evertything is totally messed up I don't even know where to begin.
Basically the path structure is
... (6 Replies)
The below command works in the terminal interactively but not as part of a bash script. I though maybe I needed to escape the "$dir" so it isn't interpreted literally, but that's not it. Thank you :).
interactively in terminal
dir=/path/to
new=$(ls "$dir"/*.csv -tr | tail -n 1) && echo... (6 Replies)
Discussion started by: cmccabe
6 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)