can anyone explain me difference between tar and ufsdump commands.............and also i wd like to know the difference between incremental and differential backup.........
thx in advance (1 Reply)
What is the difference between:
cd /tmp
tar -cf - *.txt |gzip > tmp_txt.tar.gz
and
cd /tmp
mknod pipe p
gzip < pipe > /tmp/tmp_txt1.tar.gz &
tar -cf pipe *.txt
Apart from the fact that we have to create the pipe file manually, is there any difference in the performance of the two?... (5 Replies)
Hi,
I am trying to launch an ogg movie from a pdf file which has been produced with pdflatex and
\movie
{\centerline{\includegraphics
{grafiques_xerrades/un_manolo_amb_camera.pdf}}}
{hlims_xerrades/XocCumuls.ogg}
The switch "externalviewer" makes kpdf launch the default... (5 Replies)
If I want to declare an array of structures in C and have the number of items in that array to correspond to the items of an enumeration, is there a way to access the maximum value in the enumeration when declaring the array?
For instance:
typedef struct
{
various fields....
} ... (3 Replies)
On another simple topic, multiple choice answers OK ( you can pick more than one or suggest others - we will add your suggestions to the poll ).
What Types of Food Do You Like The Most? (27 Replies)
the following excludes certain directories successfully
cp -r probe/!(dir) /destination
I want to exclude certain file types and tried unsuccessfully
cp -r probe/!(*.avi) /destination (2 Replies)
Can I please have some ideas on how to do a recursive grep with certain types of files? The file types I want to use are *.c and *.java.
I know this normally works with all files.
grep -riI 'scanner' /home/bob/ 2>/dev/null
Just not sure how to get it to work *.c and *.java files. (5 Replies)
Discussion started by: cokedude
5 Replies
LEARN ABOUT CENTOS
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)