All Questions
13
questions
1
vote
1
answer
198
views
Compare three files: lines present in all of them using column comparison
I have three files 2d.tsv, 3d.tsv, 4d.tsv, and they are of the same format (same number of columns with the same data type, but with different numbers of rows).
I want to select rows that are present ...
2
votes
4
answers
3k
views
How to extract columns before and after a string ocurrence
I have a text file. That looks like:
www.ac.com has address 6.1.1.146 www.ac.com is an alias for ac.com. www.ac.com is an alias for ac.com.
www.ba.net is an alias for www-bn.gs.ba.com. www-bn.gs.ba....
- 851
-3
votes
1
answer
157
views
How can we find all the files under a directory whose contents contain any of several strings? [duplicate]
I was wondering how to find all the files under a directory whose contents contain any of several strings word1, word2, word3, ...?
Thanks.
- 103k
4
votes
4
answers
686
views
If Else, Awk NR: How to remove a section header of table where there are no entries
I am trying to summarise a table of data that changes everyday. I have already summarised the table to only display rows with entries that are larger than 30.
However, on some days, there are no ...
- 51
0
votes
1
answer
136
views
To Make File name according to their IDs
I want to replace each file name with their specific IDs. My files are 30,000 and so their respective IDs. Can it be possible to fetch ID which is inside in each file on line number 2 and become a ...
- 29
3
votes
1
answer
1k
views
How does opening a file descriptor effect memory
Let’s say I have a 250MB file that I read from by opening a file descriptor. Does the entire file get dumped into memory and stay there until I close the file descriptor?
How does that differ from ...
0
votes
2
answers
4k
views
Cat a file with grep, showing current "cat" line
I search through a HUGE file with cat and grep. I need to know on which line is cat all the time.
If i want to search ball:
cat file.txt | grep ball
FILE:
football
tennis
hockey
basketball
...
...
- 13
2
votes
3
answers
2k
views
Add mtime to grep -c output and sort the output by mtime
I have a directory full of logs named in the following style:
info.log00001
info.log00002
info.log00003
...
info.log09999
info.log
My current output (using grep -c)
I need to analyze the ...
- 123
1
vote
1
answer
399
views
How to grep several files using part of filename as a pattern?
I have a folder which includes several files named order[ID].log where [ID] is a string e.g.
orderID1.log
orderID2.log
orderID3.log
orderID4.log
...
I need to write a script in Linux to grep each ...
- 15
0
votes
1
answer
1k
views
SED - Find and replace with special characters (#, , % )
I'm aware that this is a really simple question, but I'm struggling to find a solution to this .
I need to automatically find and replace in the /etc/aliases file the following section:
# Person ...
- 137
4
votes
4
answers
987
views
Find lines in (multiple) files that contain the given line in an input file
If I have a number of files like the following:
file1:
123
456
789
012
file2:
line1 922
line2 392
line3 456
line5 291
line6 201
...
file3:
line1 111
line2 123
line3 19
line5 542
line6 ...
- 241
2
votes
1
answer
241
views
string search using awk
I have file-1 which has list of transaction id .
File -1
201503301616|9b8791b3-f860-409f-aad0-24debf834c1b|10.233.18.29.677220869928387637969
201503301616|9b8791b3-f860-409f-aad0-...
- 23
5
votes
4
answers
3k
views
How to remove text matching specific patterns from a file
I want to compare two files to check for differences between them, fileA and fileB.
fileA is like a template file and fileB is the file which I want to compare to it. Anytime I find a difference I ...
- 151