This is, again, a useless use of cat, inefficient and occasionally dangerous.
I don't think your xargs version is going to work, since it will take multiple arguments beyond the first one to be filenames. If your system supports xargs -n, the -n 1 parameter would fix that.
Hi,
I am taking backup in every hr and every day, I want to programmatically check my backup files are identical with original files. Any methods are available in Unix scripts? Any idea.? I don't want to download both and compare, I looking for idea to develop a script to read both files and... (3 Replies)
I am looking to replace two or more strings on different lines using sed, but not with the same variable. IE
# cat xxx.file
<abc>
abc def ghi
abc def ghi
abc def ghi
currently I can only change each line with the same pattern:
# sed -e '/<abc>/!s/abc\(.*\)/jkl mno/' xxx.file
abc jkl mno... (3 Replies)
Hello Experts,
I have two files called "old" and "new". My old file contains 10 lines and my new file contains 10 + "n" lines.
The first field in both these files contain ID. I sort these two files on ID. I am interested in only the lines that are in the new file and not in old.
I tried... (4 Replies)
Hi All,
I am having hard time in getting two almost identical rows into one, I know how to do if starting word is unique, anyhow this is my problem
Input File:
issue1 5167
dum 1 1 kkk 7888
dum 2 1 ffff 7888
dum 2 2 llll 7888
dum 3 1 eee 7888
issue2 7667
dum 2 1 jjjj 8999
dum 2 2 jjjj... (3 Replies)
I have my Ubuntu system nicely tailored to my needs, with specific software installed, and other things removed.
I'd like to build a new PC, and have the identical software configuration on it. Is there some easy way to export the list of installed software to a file? Then have the new machine... (3 Replies)
Mysql log has something like below:
I need a bash shell script that will do the following:
1) The script will scan the mysql.log file constantly in real time (something like tail -F mysql.log)
2) If it encounters 5 consecutive identical lines then it would invoke some commands (say... (4 Replies)
I am trying to extract a table of data (mysql query output) from a log file. I need to print everything below the header and not past the end of the table. I have spent many hours searching with little progress. I am matching the regexp +-\{99\} with no problem. I just can't figure out how to print... (5 Replies)
Hi,
I have a file as follows.
file1
Hello
Hi
His
Hi
Hi
Hungry
hi
so I want to delete identical lines while leaving one of them undeleted.
So desired output will be
Hello
Hi (2 Replies)
I have some data that looks like this:
PXD= ZW< 1,6
QR> QRJ== 1,2(5)
QR> QRJ== 4,1(2)
QR> QRJ== 4,2
QRB= QRB 4,2
QWM QWM 6,2
R<C ZW< 11,2
R<H= R<J= 6,1
R>H XZJ= 1,2(2)
R>H XZJ= 2,6(2)
R>H XZJ= 4,1(2)
R>H XZJ= 6,2
RDP RDP 1,2
What I would like to do is if fields $1 and $2 are... (5 Replies)
Discussion started by: jvoot
5 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)