All Questions
155 questions
1
vote
1
answer
113
views
How is it possible that a command chain ending in `cat` prints nothing, but executing `cat again on the same file prints a line?
I run this command sequence:
grep -Fxv "sudo: myname : 1 incorrect password attempt ; TTY=pts/3 ; PWD=/home/myname/workspace ; USER=root ; COMMAND=/usr/bin/pip uninstall ansible" ~/.log-...
0
votes
1
answer
60
views
copy from text file to other text file , but not owerwiting first 2 lines [duplicate]
I would like to copy the contents of a text file has another text file but do not crush the first 2 lines of the other file, or copy and add the 2 lines to the new file
Exemple:
user1.txt:
Phill
Johne
...
- 11
-1
votes
1
answer
81
views
If I execute a task from terminal it works, but within a script it don't...Why? [closed]
Tried every step from terminal, one by one. And they work, but when I execute
cat $dj_name | grep -Eo "(https)://[a-zA-Z0-9./?=_%:-]*.mp3*" | sort -u > $dj_name-tracks
in a script, the ...
0
votes
1
answer
38
views
chnaging a specific column in a specific row with for loop
I have a file with following content
### beginning of executable commands
### load the necessary module files
module load GCC/11.3.0 OpenMPI/4.1.4 CP2K/9.1
### your program goes here (a.out is an ...
- 1
-1
votes
1
answer
100
views
bash script that receives any sequence of nucleotides and print all positions of the T nucleotides
I need to write a bash script that receives any sequence of nucleotides and print all positions of the T nucleotides.
I did the following:
'vim nucleotide.sh'
inside the script
#!/bin/bash
$@
cat $@ | ...
- 29
1
vote
4
answers
2k
views
How to search a file in linux containing a particular string and then printing all contents of that file?
Requirement : Searching a file in linux containing a string and then printing all contents of that file.
Approach I used: grep -ri "<string_name>" | cut -d : -f1
Using this command I ...
0
votes
2
answers
58
views
grep a word from a list of file as a result of grep before
I have a command to grep a file with fullpath that contain a "TypeId: 0", here is the command
grep -rnw /home/username/app/data/store/0/part/.mv -e "TypeId: 0" | awk -F ":&...
- 35
0
votes
1
answer
2k
views
How use cat and grep with gsutil and filter with a subdirectory name?
Currently, for getting a string (here: 123456789) into some files in all my buckets I do the following:
gsutil cat -h gs://AAAA/** | grep '123456789' > 20221109.txt
And I get the name of my path ...
- 144
0
votes
2
answers
162
views
Gnuplot: assign the resulted grep in log file to a variable
my logfile is as:
********************************************************************
maximum disp: 3.2580e-05, at node: 3, of total: 6
maximum disp: 4.2876e-05, at node: 6, of total: 6
*************...
- 1
0
votes
3
answers
139
views
How to load a multiline setting from a file using bash?
I have a long config file which looks like:
<some stuff before our example>
'Realtime' => [
'foo' => 'bar',
'enabled' => true,
'lorem' => 'ipsum'
],
&...
- 75.6k
-1
votes
4
answers
55
views
Renaming variant column
I have a large file with rsIDs in the 2nd field.
Some variants are in this format: chr1-97981343:rs55886062-AT
Using bash commands, how can I replace these identifiers to just print the rsID (e.g. ...
- 109
3
votes
4
answers
303
views
bash - extract specific value from file
I have a file that looks like this:
odule(load="imfile" PollingInterval="10")
$MaxMessageSize 65536
#RSYSLOG_ForwardFormat template is used to enable millisecond-accuracy
$...
- 131
1
vote
1
answer
82
views
How can I grep or cat files which begin with a specific number until another specific number?
I would like to grep or cat only files that begin with a specific number and are in a range until a specific number, e.g.:
abc_server.2022-04-09-34.log
until
abc_server.2022-04-09-50.log
How can I ...
- 1,498
3
votes
7
answers
187
views
How to print lines where it matchs specific number in bash?
I have a text file called file.txt like below,
01_ABC_0000 AA
02_CDE_0000 BB
03_EFG_0000 CC
04_ABC_0001 DD
05_CDE_0001 EE
06_EFG_0001 FF
where it should separated into two different files, like
...
user18091468
1
vote
1
answer
125
views
how to copy&paste cleanly into grep? [closed]
I have some test output, looking like
PASS: tests/test_mutex_rmw
PASS: tests/test_mutex_trylock
PASS: tests/test_malloc_irreg
FAIL: tests/ARMCI_PutS_latency
FAIL: tests/ARMCI_AccS_latency
PASS: tests/...
- 1,023
-1
votes
2
answers
228
views
How to see several lines under one grep line
I want to see the logs where log level is ERROR
and I want to see the stackTrace
but when I input like below
cat app.log | grep ERROR
I can't see the stackTrace
Is there a way to see several lines ...
user17803116
1
vote
3
answers
75
views
bash: cat + grep to produce several replicas merging two filles
Using Linux bash command line, I need to merge two filles integrating several copies of the file1 inside the specified part of the file 2. The file 1 looks like:
ATOM 1 N SER A 1 -2.390 ...
- 193
1
vote
2
answers
118
views
How to get only one part of the string without the end in bash
I want to get only one part of the string new-profile-input, the part that I need is: "new-profile" without the "-input".
I tried like this:
cat automatization_test.sh | grep -oh &...
- 59
1
vote
1
answer
849
views
using only 'grep' command to get specific column
This below shows this some lines of csv file, i want to get the results that only get the Population column with only using grep command.
id,Association,Population,Variant(s),Gene(s),PubMed
1,non-...
- 33
0
votes
3
answers
267
views
Test if the input stream not empty without consuming data from it
Consider next snippet.
generate_build_specs(){
echo ubuntu gcc9 debug
echo macos clang debug
echo macos gcc10 release
echo macos clang release
}
generate_build_specs | awk -v IGNORECASE=1 '/...
- 8,031
1
vote
3
answers
131
views
Replace work in line by combining after grep
I need to replace a word after performing a grep and getting the last line of the result.
Here my example file:
aaa ts1 ts2
bbb ts3 ts4
aaa ts5 ts6
aaa ts7 NONE
What I need is to select all lines ...
- 1,205
-3
votes
1
answer
86
views
Need help, can't see the mistake [closed]
My job is to follow a pipeline of different commands according to the specifications of a paper. However, there is a command with which chromosome names are to be changed. The command is so ...
1
vote
5
answers
791
views
How to use awk to filter a .csv file [duplicate]
I was wondering how can I get the names of the fruits in from this .csv file by using awk or some other cli tool.
I used a macro in vim to edit the file, but I would think that there is an easy one ...
-1
votes
2
answers
636
views
Bash print file contents between two strings
a
b
s
start
text
more text
end
even more text
end
I want to print the content between start and first end that follows the start (start is always unique). I also want to print between which lines the ...
- 515
3
votes
3
answers
123
views
How to grep similiar values one by one under each other?
I Have grep from file output like:
2531 POKRZYWNIAK KRZYSZTOF 244 18/01 2 13:46 23:26
3346 SOROTA DARIUSZ 244 18/01 1 04:05 13:46
Need to get it look like this:
2531 POKRZYWNIAK KRZYSZTOF 244 18/01 2 ...
- 41
1
vote
1
answer
214
views
How do I recursively grep files in multiple folders? I'm unable to pipe the recursive cat output
I have 4 folders, set1, set2, set3, set4).
Each folder has 1 file called result.txt.
Contents of each of the result files look like this:
result is:
score=19
i'm able to recursively cat the file ...
- 73
0
votes
2
answers
1k
views
How can I list only directory names, with no trailing "/"?
by doing the following command in the folder
ls -d */ | cut -f1 -d'/'
I get entries like:
env1
env2
env3
env4
how I can use cat/grep or yq/jq or any other alternative command(s) instead of the ...
- 67
-1
votes
1
answer
78
views
Linux Internal Process for Cat and Grep [closed]
I'm newbie to linux back round process, for example i have the below linux command, Maybe the question will duplicate here but i couldn't find answer so posting it.
cat test.txt | grep hello
how ...
- 512
0
votes
1
answer
891
views
How to use grep with curl for lots of urls and return $url
After a lot of cutting and filtering i got a list of urls, in a text file.. i want to pass these urls to a curl command to curl all the urls in the text file and at the same time, grep the output of ...
1
vote
3
answers
163
views
grep for "fixme" as well as "fix me" and then cat results in single file
I am trying to achieve two things here:
grep for fixme as well as fix me.
the results of the above grep should be in a single file
Count number of fixme (including fix me)
for step 1 I tried
grep -...
- 21
2
votes
1
answer
113
views
Getting a row from a .anno file only when the value of a column is present in a text file
I'm really newbie with scripting and also with stack, so I'm sorry if my question is silly or misplaced.
I have to do a task in Bash.
I have a DATA.anno file like this one:
ID POP LOCALITY
1 Apu ...
- 91
0
votes
1
answer
261
views
Executing cat|grep|grep using 2 pipes
Title is self-explanatory on what I want to do so here is my current code:
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/wait.h>
int main() {
...
- 275
-1
votes
2
answers
2k
views
Best way to find value of a Bash variable in another file without "source"?
Without using source to load another Bash config/script file, what is the simplest way to find the value of a Bash variable that is defined in a different (temporary) file?
I have seen similar ...
0
votes
3
answers
1k
views
Piping into grep using cat returns error: no such file or directory
I am practicing on bash. When I try this command, I get an error: "grep: where: No such file or directory".
cat file2.txt | tr " " "\n" | grep –i where | wc -l
Content of file2.txt = 1 2 3 4 where 5 ...
- 75
1
vote
2
answers
1k
views
Extract field from /proc/meminfo file
/proc/meminfo file gives the cpu requirements of a machine. The out out of the command is as follows:
MemTotal: 2002424 kB
MemFree: 1061248 kB
MemAvailable: 1562492 kB
Buffers: ...
0
votes
1
answer
37
views
Combine 3 files into one
I have 3 files.
File1
Red
Blue
Green
File2
Apple LadyBug Fire Red Set1
Lettuce Grass Frog Green Set1
Jean Ocean Sky Blue Set1
File3
BlueBerries Blue Set2
Rose Red Set2
Tree Green Set2
Output
...
0
votes
0
answers
60
views
Partial file lines replace in linux
I have a file containing some lines
Example:
Line 1 , @A11 @A21 @A31
Line 2 , @A12 @A22 @A32
Line 3 , @A13 @A23 @A33
I have other files which lines might contain some of the lines in the above ...
- 63
0
votes
1
answer
1k
views
Bash Mapfile or Read while grep-ing contents of a file
Just looking for any other, perhaps better ways to do the following. Shell check is calling "SC2002 Useless cat" and every other way I have tried to mitigate has failed. It is working as desired, so ...
1
vote
2
answers
3k
views
How to select date range in awk
We are making a utility to ssh to different servers and collect all the error logs and send to the concerning teams this utility will cat the log file and filter using awk. e.g.
cat /app1/apache/...
- 49
1
vote
1
answer
1k
views
Loop through files to find a string and send files containing that string to directories of the same name in bash
I have a parent directory with ~500 files with each filename beginning with cert, i.e. cert-104.mol2, cert-105.mol2 and so on. Each of these cert files contains a seven number identifier inside, i.e. ...
- 798
2
votes
1
answer
665
views
Not getting grep result using popen with cat and multiple process pipes
I am trying to get grep to work using pipes and subprocess. I've double-checked the cat and I know it's working, but for some reason the grep isn't returning anything, even though when I run it ...
- 21
0
votes
2
answers
483
views
How to show specific word from a specific line?
let say I have a text file and I want to show echo from it only the 3rd word in the 48th line, how can I do it?
I was able to show a specific line from the text file:
sed -n 48p log.txt
but now I ...
- 1
0
votes
2
answers
35
views
Print specific lines from file
I have a text file like this:
OBJ O1 = {
{P11},
{0}
};
OBJ O2 = {
{P21},
{P22},
{P23},
{0}
};
OBJ O3 = {
{P31},
{P32},
{0}
};
I want to print only lines starting by OBJ O2 and ending by first {0} ...
- 17
0
votes
2
answers
65
views
Search a value in a file and change a number 3 lines after match
We want to find a specific line in a file and change a value 3 lines after the match.
For example we are searching for the string "class_rproxy"
cat /var/git/control/Puppetfile | grep -A 3 ...
0
votes
3
answers
149
views
Merge multiple files containing same IDs - Linux
i have 10000 files in One folder like this :
1000.htm
Page_1000.html
file-1000.txt
2000.htm
Page_2000.html
file-2000.txt
i want merge each files that have similar name
example :
1000.htm Page_1000....
- 33
0
votes
2
answers
381
views
How to use lines in a file as keyword for grep?
I've search lots of questions on here and other sites, and people have suggested things that should fix my problem, but I think there's something wrong with my code that I just don't recognize.
I ...
- 5
1
vote
2
answers
255
views
Output file much larger than input files after cat + grep
I have 18 csv files, all between 1mb and 14mb. The sum of all files is 64mb. I want to create a new csv file that contains a subset of those files-- only the lines featuring the pattern "Hello" (or "...
2
votes
2
answers
3k
views
Pipe cat/grep/arguments into variable in bash script
#!/bin/bash
DATE=`date +%Y-%m-%d`
HOUR=`date +%H`
ORDERS_THIS_HOUR=`cat cli.log | grep $DATE $HOUR | grep -o "generated for Production" | wc -l`
OUTPUT="$DATE $HOUR : $ORDERS_THIS_HOUR"
echo "$OUTPUT"...
- 756
1
vote
2
answers
124
views
sequentially replace a word using another text file list of words - data_file
in my head I have:
read "original_file",
change line 3 "ENTRY1" to be that of the FIRST Word in data_file.
write out new_file1.
read "original_file",
change line 3 "ENTRY1" to be that of the SECOND ...
user9680065
0
votes
3
answers
4k
views
Recursive grep for gz files search string from an output string
I'm trying to search a string from an output of a string in recursive search with gz files folder.
I'm using the command which is only worked:
find . -name "*.gz" -exec zgrep -H 'PATTERN' \{\} \;
...
- 41