All Questions
114
questions
32
votes
5
answers
56k
views
How to grep for text in a file and display the paragraph that has the text?
Below is the text in the file:
Pseudo name=Apple
Code=42B
state=fault
Pseudo name=Prance
Code=43B
state=good
I need to grep for "42B" and get the output from the above text like:
Pseudo name=...
- 421
28
votes
4
answers
13k
views
Print lines between (and including) two patterns
I want to start grepping from the lines that has CK at the end of line and stop grepping when the line has D at the end. I tried grep "$CK" "$D" file..txt, but it didn't work.
Input:
kkkkkkkkkkk
...
- 931
33
votes
5
answers
85k
views
Multiline pattern match using sed, awk or grep [duplicate]
Is it possible to do a multiline pattern match using sed, awk or grep? Take for example, I would like to get all the lines between { and }
So it should be able to match
1. {}
2. {.....}
3. {........
user6106
41
votes
8
answers
44k
views
How to grep-inverse-match and exclude "before" and "after" lines
Consider a text file with the following entries:
aaa
bbb
ccc
ddd
eee
fff
ggg
hhh
iii
Given a pattern (e.g. fff), I would like to grep the file above to get in the output:
all_lines except (...
- 41.6k
43
votes
16
answers
123k
views
How can I remove all comments from a file?
I have a file which includes comments:
foo
bar
stuff
#Do not show this...
morestuff
evenmorestuff#Or this
I want to print the file without including any of the comments:
foo
bar
stuff
morestuff
...
- 3,975
6
votes
5
answers
13k
views
How do I append/prepend a timestamp to grep output?
I am running a small linux server at home, and I am writing a script to log the temperature of the CPU cores every 5 seconds, but I need timestamps for it to be useful. So far I have something that ...
- 75
112
votes
7
answers
73k
views
Is there a basic tutorial for grep, awk and sed? [closed]
I've been a Linux user for a while, and I've a pretty decent understanding of most the common command line utilities. However, ones that come up and up again in relation to programming are grep, awk, ...
- 3,800
95
votes
7
answers
255k
views
How to read first and last line from cat output?
I have text file. Task - get first and last line from file after
$ cat file | grep -E "1|2|3|4" | commandtoprint
$ cat file
1
2
3
4
5
Need this without cat output (only 1 and 5).
~$ cat file | ...
- 1,083
29
votes
7
answers
97k
views
How to extract logs between two time stamps
I want to extract all logs between two timestamps. Some lines may not have the timestamp, but I want those lines also. In short, I want every line that falls under two time stamps. My log structure ...
- 291
7
votes
5
answers
4k
views
Identifying genes from a list of genes
I have a gene list file. Some thing like this
SWT21
SSA1
NRP1
EFB1
TFC3
MDM10
I have another file which also contains the names of these genes in my list along with other ...
- 2,559
62
votes
3
answers
189k
views
How to grep lines between start and end pattern? [duplicate]
I have a file which is having following content:
zdk
aaa
b12
cdn
dke
kdn
Input1: aaa and cdn
Output 1:
aaa
b12
cdn
Input 2: zdk and dke
Output 2:
zdk
aaa
b12
cdn
dke
I could use below commands ...
- 1,029
44
votes
3
answers
117k
views
Piping from grep to awk not working
I am trying to grep the ongoing tail of file log and get the nth word from a line. Example file:
$ cat > test.txt <<EOL
Beam goes blah
John goes hey
Beam goes what?
John goes forget it
Beam ...
- 9,667
29
votes
1
answer
14k
views
When to use grep, less, awk, sed [closed]
I'm entering the world of Linux and at work I'm using grep more and more. By doing that I'm figuring out that sometimes it's not adequate for what I want.
I was struggling with grep a few days ago ...
- 441
17
votes
5
answers
9k
views
Find files that contain multiple keywords anywhere in the file
I'm looking for a way to list all files in a directory that contain the full set of keywords I'm seeking, anywhere in the file.
So, the keywords need not to appear on the same line.
One way to do ...
- 372
12
votes
3
answers
23k
views
GREP / SED or AWK: Print entire paragraph in a file on pattern match [duplicate]
I have a file with hundreds of paragraphs of around 15 lines each. I need to search for a pattern, say Occurrence: 1. If this pattern is found in the para, I need to print the entire paragraph. Note ...
- 121