All Questions
25
questions
2
votes
4
answers
292
views
Show changes between consecutive lines of a file
Is there an easy way to see how lines are changing in a file?
For example, assume I have this "my.log" file:
cpu1 cpu2 cpu3 cpu4
5 3 3 6
5 3 3 6
5 0 3 6
...
- 123
0
votes
3
answers
61
views
Changing content format [duplicate]
I have a text file which has 1000 rows/entries. These 1000 entries correspond to the column names for my dataframe. These are the new features that need to be added to the dataframe for model ...
- 19
0
votes
3
answers
2k
views
Find a value in a specific position when the only information you have is the position
I have a csv file approximately 16,000 rows long, with two fields. The first field contains a list of numeric values, and the second field contains a list of first and names delimited by semi-colons ...
- 3
2
votes
1
answer
87
views
any way to make this command chain shorter or better
I am using this command chain to filter out bot/crawler traffic and ban the ip addresses. Is there any way i can make this command chain more efficient?
sudo awk -F' - |\\"' '{print $1, $7}' access....
- 193
1
vote
1
answer
152
views
How to parse strings from a file in multiple other files?
I am trying to grep a list of strings listed in 7253.txt which looks like this:
rs11078372
rs1124961
rs11651880
rs11659047
rs1736209
using:
grep -o -f 7253.txt *.logistic > result.txt
from ...
- 35
1
vote
1
answer
41
views
Element comparison between subsequent lines, assigning a value for each null output
I have an output which looks like this:
ASCII file
I want to pick up the last element from the rows that contain the string "Fe\s2b". But the thing is each occurrence of "H\s\s1\s\s\s\s\s\s4861.33A" ...
- 111
0
votes
2
answers
5k
views
Find specific folder path in s3 bucket
I'm searching a folder in s3 bucket using this command
aws s3 ls s3://bucketname/dir1/dir2/dir3 --recursive | grep -i 'dir3'
It's getting results like
dir1/dir2/dir3/1/aaa.txt
dir1/dir2/dir3/1/bbb....
- 11
-1
votes
3
answers
380
views
How to use grep and/or awk to select multiple pathnames in file and remove those files?
I have some output that is formatted like so:
foo: /some/long/path_with_underscores-and-hyphens/andnumbers1.ext exists in filesystem
foo: /another/one.ext exists in filesystem
bar: /another/path/and/...
- 69
0
votes
1
answer
214
views
Bash User Input Search For Who is On Server If Statement Error Too Many Arguments
I am working on an assignment that requires me to accept user input to search for current users on the server and if the user input is online, I need to output the users name. If the user is not ...
0
votes
3
answers
921
views
How to match a pattern in lines before another pattern match
This question is similar to How to show lines after each grep match until other specific match?
I want to match a particular pattern in lines before another pattern match.
Here I want to get the ...
- 103
9
votes
2
answers
8k
views
Testing regex from stdin using grep|sed|awk
Sometimes, I want to test is my regex correct.
How can I do reverse regex match from stdin?
F.e. I can match a string with provided regex, like:
grep "\(foo\)-bar"
foo
bar
foo-bar
foo-bar #Match ...
- 1,573
1
vote
1
answer
913
views
extract lines from large tab delimited file using a list
I have a large tab file with 15 columns (FILE1) and a list (FILE2) of names which should appear in the table. The problem is the name may appear in columns 4 to 10 in FILE1 and it may not be a case ...
- 185
0
votes
1
answer
97
views
how grep text upto next space?
7/04/27 10:50:17 INFO Master: Driver submitted org.apache.spark.deploy.worker.DriverWrapper
17/04/27 10:50:17 INFO Master: Launching driver driver-20170427105017-0000 on worker worker-20170427103840-...
- 131
1
vote
3
answers
947
views
How do I make a substitution to `$0` but save the old value?
I'm trying to rename all files that start with an "m" to be the same name except with the first character (or "m" in this case) stripped away.
My strategy is to:
List all the files, with ls
Filter ...
- 3,170
2
votes
4
answers
335
views
Grep with range and pass three filters
I have a file sample.txt
-------------
ord:chandru SAM
XY DUPL
KEY:ZZ
-------------
ord:RAM SAM
XY DUPL
KEY:UU
-------------
ord:chandru SAM
XY DUPL
...
- 191