Can someone help me with the following 2 objectives?
1) The following command is just an example. It gets a list of all print jobs. From there I am trying to extract the printer name. It works with the following command:
lpstat -W "completed" -o | awk -F- '{ print $1}'
Problem is, I want... (6 Replies)
I need to add the content of file1 to file2 - all lines but not those existing in file2 already, so the "cat file1 >> file2" doesn't work.
For example,
file1:
100 xxxxxx str1
102 xxxxxx str2
File2:
50 xxxxxxx xxx
30 xxxxxxxxxxx
102 xxxxxx str2 xxxx
......
the result:
50 xxxxxxx... (9 Replies)
Hello,
I have file to work with. It has 5 columns. The first three, altogether, constitutes the position. The 4th column contains some values for downstream analysis and the fifth column contains some values that I want to add to 4th column (only if they happen to be in the same position).
My... (5 Replies)
I know uniq exists, but am not sure how to remove repeating lines when they are groups of two different lines repeating themselves, without using sort. I need them to be sorted in the original order, just to remove repeats.
cd /media/AUDIO/WAVE/9780743518673/mp3
~/Desktop/mp3-to-m4b... (1 Reply)
Hello all,
I need to print all the lines before a specific string and print a custom message 2 lines after that.
So far I have managed to print everything up the string, inclusively, but I can't figure out how to print the 2 lines after that and the custom message.
My code thus far is:... (4 Replies)
Hey Guys!
I have written a code which combines lots of files into one big file(.csv).
However, each of the original files had headers on the first line, and now that I've combined the files the headers are interspersed throughout the new combined data frame. For example, throughout the data... (21 Replies)
Hi !
I need some help with a script I am writing.
I am trying to compare two files, the first file being in this format :
Header1
Text1-1
Text1-2
Text1-3
Header2
Text2-1
etc...
For each header, I want to check if it appears in the second file, and if it is the case print the header... (4 Replies)
Hi,
I'm having trouble in achieving the following scenario. There is a txt file with thousands of lines and few lines are repeated, which needs to be removed using a script.
File.txt
20140522121432,0,12,ram
Loc=India
From=ram@xxx.com, To=ravi@yyy.com,,
1
2
3
4
.
.
30... (18 Replies)
The bash below executes and seems to work fine on those files in which . However on those files where there is no additional CNV detected that line repeats multiple times
instead of only once. I tried adding an END as all lines are printed but that doesn't help. I can not seem to solve this... (5 Replies)
Discussion started by: cmccabe
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)