Print everything between 2 patterns if grep is not found the search word
example
Detroit
orange
cat
bat
rat
apple
sed -n "/Detroit,/apple/p" d |grep chicago
output would be
Detroit
orange
cat
bat
rat
apple
Not sure if I understood this, but what do you want to display if grep **does** find something in the file?
I assume in that case you want to show the output of grep.
Is the following what you're looking for?
hi,
i'm having problem like this.
i wish to grep some keyword from certain files in one directory.
let's say i have a lot of files in my directory with the name of file.1 file.2 file.3 ...... file.500
i only wish to grep the keyword from file.20, file.21, file.23 .... file.50
i tried... (5 Replies)
Hi,
I try to grep lines with pattern like
float_or_int float_or_int float_or_int
where float_or_int is any float or any integer of any length.
I tried some :
grep "* * *" FILENAME #Work for integers but not for floats
grep '\<.*\> \<.*\> \<.*\>' FILENAME #Work for float but not... (4 Replies)
Hello,
How do I use grep to find a pattern in a list of file and then display 5 lines after the pattern is matched
Eg:
I want to match the string GetPresentCode in all files in a folder and then see 4 lines following this match. I am not sure if grep is what should be used to achieve. Thanks!... (3 Replies)
Hi
How to prevent grep command from throwing a system trap(or returning error status) if No match is found in the specified file(s) ?
Consider this simple shell script:
#!/usr/bin/ksh
trap 'STATUS=$?;set +x;echo;echo error $STATUS at line nb $LINENO executing :\
`sed -n... (2 Replies)
Hi there
I would like to search a file for a certain pattern, but i don't know the exact pattern i need to search for.
What i do know is that i need to search for the pattern that exists the most in a certain file.
so if a file looksike this:
summer, summer, winter, spring, summer... (4 Replies)
Hi all,
Is it possible for grep to output just the pattern match and not the whole line when it comes across a match? I know you can adjust the number of trailing or leading lines that are printed, but am yet to find anything that outputs just the pattern match.
Cheers,
Tim (5 Replies)
Hi,
I need something unusual, I guess. I need to start a process, and if that process displays a specific error message, I need to kill that process and restart it.
Something like:
startprocess | grep -i "This is the specific error message" && kill $pidof(startprocess)
Explanation, I need... (4 Replies)
Hi All,
From the below line if we want to display all the text till found pattern dot/. I was trying with the below code but couldn't able
to print text before the pattern. it display texts which is found after pattern.
awk '/assed/{print;getline;print}' file_name | sed 's/^*. *//'
input... (4 Replies)
Hello Everyone ,
I have two files. I want to pick line from file-1 and match with the complete data in file-2 , if there is a match print all the match lines in file 3. Below is the file
cat test1.txt
vikas
vikasjain
j ain
testt
douknow
hello@vik@
# 33
||@@ vcpzxcmvhvdsh... (1 Reply)
Looking for help,
i have input file like below and want to modify to expected output, if can without create additional file, hope can direct modify it.
have 2 thing need do.
1st
is adding a word (testplan generation off) after ! ! IPG: Tue Aug 07 14:31:17 2018
2nd
is adding... (16 Replies)
Discussion started by: kttan
16 Replies
LEARN ABOUT DEBIAN
expect_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)