All Questions
44 questions
0
votes
2
answers
41
views
Capture and print on the exact match from a file
I am trying to use grep to match only a specific part of a row in a file.
The file is a huge csv file with some columns containing json with commas so it is hard to figure out which column what I am ...
- 121
-2
votes
2
answers
1k
views
Generate strings from regular expression in bash
How in Bash to generate a string given by a regex expression and pipe it to another command?
For example:
> $RANDOM | regex "{abcdef\d}[8]" | grep "1{3}" | less
I did not find ...
- 99
1
vote
1
answer
55
views
fix filenames with wrong starting and ending character(s) in Bash, mass renaming
I need to rename a lot of files by removing the 1st and the last characters (before .ext).
WRONG>
'1st moto ride [Aug '99]'.mp4
'Samuel' Song'.mp3
'Plane Landing'.avi
'"Ode" (sort of) to ...
- 33
0
votes
1
answer
544
views
regular expression - command not found on terminal
I am trying to grab my_name 369 from file.txt
I input this grep line with regex but it return an error. I have tried using egrep and it did not work.
Input:
my_name 369 == match
my_name 161 == match
...
- 61
0
votes
4
answers
421
views
Changing the name of a file based on a part of its original name that are between the first two instances of a character
I am trying to change the names of my files based on the string between the first two instances of "|". This is what my problem looks like:
>1234|interest1|randomstuff1.txt
>5678|...
- 3
-1
votes
1
answer
40
views
bash + verify if file that ended with many combinations exists [duplicate]
we can have the /tmp/file.1 or /tmp/file.43.434 or /tmp/file-hegfegf , and so on
so how we can verify in bash if any /tmp/file* exists ?
we try as
[[ -f "/tmp/file*" ]] && echo "...
- 13.7k
0
votes
1
answer
518
views
sscanf equivalent in shell script
I have a file which has some stats and counters stored for some ACL rules. I want to design a shell script to read that file and parse those counters.
I have done the similar thing in c programming ...
- 131
0
votes
1
answer
194
views
I'm trying to understand how to shorten regex
I'm trying to list all directories that are 1GB or larger. I know I could use ncdu, but at the moment, I'm just trying to understand how to shorten regex...
I found this command, du -h . | grep '[0-9\....
- 15
-1
votes
2
answers
95
views
SED - Generate line only if match some words in OTHER LINE [duplicate]
Assume I have 2 files in a folder
...
product: Nike New Awesome Running Shoe
price: 123
color: black
...
...
product: Nike New Awesome Salloon Soccer Shoe
price: 123
color: black
...
I need to ...
-1
votes
5
answers
161
views
SED - Generate line using some content of other line
I have some files in a folder
Each file has this structure:
...
product: Nike New Awesome Shoe
price: 123
color: black
...
I need to accomplish bellow scenario using single SED command, in all files ...
0
votes
1
answer
1k
views
sed + remove line with word match and only if comment appears in beginning of line
delete lines with word match is easy
for example when we want to delete the line that match the word - max.connections
sed '/max.connections/d' /home/conf.txt
but how to delete the match lines as ...
- 13.7k
0
votes
0
answers
18
views
Remove Exact Strings From a File [duplicate]
How do I remove exact strings using sed, tr or awk
{98406c4acbf0f57b3ccbc923a6d507f422d9bd8656398f53433e}HTTP/1.0 200 OK
What I want to remove is HTTP/1.0 200 OK
I tried to do sed but there is a ...
- 21
1
vote
1
answer
4k
views
find all file extension recursively from directory and copy all extension files to single directory [duplicate]
I have directory with sub-dir where it has multiple extensions file. I would like to copy all ext files to single directory "scan". Tried running following cmd but doesnt work out:
find . -...
- 11
0
votes
4
answers
2k
views
How to extract numbers (digits only) from other words in text with bash
Using Bash, I want to display the number of lines that contain at least one number (a number is only made of one or several digits) in an arbitrary text. I also want to display detected numbers one ...
0
votes
1
answer
665
views
Parse audit log commands as a complete command with arguments
I have audit logs that looks as follows:
type=CWD msg=audit(1613110144.560:260397): cwd="/"
type=PATH msg=audit(1613110144.560:260397): item=0 name="/usr/bin/sed" inode=393388 dev=...
0
votes
1
answer
42
views
Moving group of files to another directory using the command "rename" with regular expressions
I have some markdown files that I want to move to a different directory called "newDirectory2" within "newDirectory1".
These files contain the string "abc" or "ABC&...
-2
votes
1
answer
2k
views
bash + Compare Strings with regex
in my bash script I want to verify if string is a disk
so I did the following example
if [[ $disk =~ sd{a..z} ]];then
echo "we found a disk - $disk
.
.
.
.
fi
but actually the expression not ...
- 13.7k
0
votes
1
answer
32
views
Proper Syntax for writing all output of a command using stdin, not just the output of the command
I am trying to send the output of a curl request to a file using regular-expression.
curl -k -v -x x.x.x.x:x https://repo.nagios.com/nagios/7/repodata/repomd.xml > curl1
Using the above syntax only ...
- 195
0
votes
1
answer
1k
views
How to download file by wget when file is named partially
here is the way how to download weel file by wget and copy it to /home/wheel.whl
wget -q http://$REPO_SERVER/WHL/wheel-0.34.2-py2.py3-none-any.whl -O /home/wheel.whl
the problem is when changing the ...
user436442
2
votes
2
answers
2k
views
bash + match regexes for both different hostnames
In my bash script I identify the machine name - kafka01 or kafka02 or kafka03 with the following regular expression bash code
if [[ $(hostname -s) =~ ^kafka[[:digit:]] ]]
then
/tmp/run.sh
fi
Example ...
user436442
1
vote
1
answer
427
views
Sort files in directories based on filename
I have > 35,000 scanned diapositives from a scientific archive in one directory. (Fortunately, the filenames are rather uniformly formatted: {year}-{place}-{film-#}-{photo-#} OR {year}-{year}-{...
- 53
0
votes
2
answers
326
views
How to filter PID from Linux SSH security logs?
Aug 12 01:30:26 server.example.com sshd[19486]: Failed password for root from X.X.X.X port 50528 ssh2
Aug 12 01:30:26 server.example.com sshd[19486]: Received disconnect from X.X.X.X port 50528:11: ...
- 1,607
0
votes
2
answers
1k
views
Regex lowercase script validation
I am working on a homework assignment to validate whether an entered string is in all lowercase letters. Here is the basic script that we are provided.
Here is the line I need to change.
if [[ "$...
5
votes
4
answers
2k
views
if with regex in bash code
In bash I did the following. This if expression will evaluate to true if the Redhat version is 7.5 or 7.6.
if [[ ` cat /etc/redhat-release | awk '{print $7}' ` == "7.5" ]] || [[ ` cat /etc/redhat-...
- 13.7k
0
votes
2
answers
2k
views
And operation and case insensitivity in awk regular expression?
I'm trying to match filenames that contain two text patterns but the matching process should ignore case. Neither of the following regular expressions work:
Setting the awk variable 'IGNORECASE' to a ...
- 1,142
0
votes
4
answers
1k
views
How to extract the CSV file name from each line of this file
I have a file which contains lines like those:
-rw-rw-rw 1 root root 6379 May 24 2016 test1.CSV
-rw-rw-rw 1 root root 23249 May 25 2016 test2.CSV
-rw-rw-rw 1 root root 2995 May 26 2016 test3.CSV
...
1
vote
3
answers
3k
views
How to test if a folder exists using regular expression in Bash?
as all know we can check easily if folder exists by the following bash command
[[ -d /opt/presto-server ]] && echo folder exist
but when we have folder as
/opt/presto-server-32.34
then how ...
- 13.7k
0
votes
3
answers
1k
views
how to check if FQDN host-name is with only small letters
we want to check the hostname on machines
the rule should be like this:
each hostname must be only with small letters
each hostname is FQDN
we try this
hostname=master01.nassa.com
[[ $hostname =~ ^...
- 13.7k
6
votes
4
answers
9k
views
BASH: Check in /etc/shadow if user password is locked
Objective: Check in /etc/shadow if user password is locked, i.e. if the first character in the 2nd field in /etc/shadow, which contains the user's hashed password, is an exclamation mark ('!')
...
- 517
4
votes
3
answers
784
views
bash + verify name by regular expression
Why does the following regular expression print valid, when the name is hdpworker01?
name=hdpworker01
[[ $name =~ worker[[:digit:]] ]] && echo valid
What I try to do is print valid only if ...
- 13.7k
1
vote
4
answers
361
views
How to match version number from output
With the following yum info call we can capture the installed version of ambari-metrics-monitor
yum info ambari-metrics-monitor| grep -i version |head -1
Version : 2.6.1.0
and to verify from ...
- 13.7k
6
votes
4
answers
5k
views
how to remove files that could be with lower/upper case
how to remove files that could be with lower/upper case
for example, the file_name could be:
STOCK.Repo or
Stock.REPO or
stOCK.repo or
stock.repo
... etc
I would run:
rm -f $file_name
the ...
- 13.7k
0
votes
4
answers
6k
views
regular expression to capture the folder name with specfic structure
what is the regular expression to capture the folder name with this structure
x.x.x.x-x ( x - integer number )
ls /usr/hdp | .....
2.6.0.3-8 current HG_MASTER 2.4.3 34.1 45-995
expected output
...
- 423
-2
votes
1
answer
88
views
bash + how to capture the first/seconf/thired field [closed]
we can easily to capture the first field by awk as this syntax
capture=` echo 1 2 3 | awk '{print $1}' `
we can easily to capture the sec field by awk as this syntax , and so on
capture=` echo 1 ...
- 423
7
votes
2
answers
32k
views
bash - case-insensitive matching of variable
This syntax prints "linux" when variable equals "no":
[[ $LINUX_CONF = no ]] && echo "linux"
How would I use regular expressions (or similar) in order to make the comparison case ...
- 13.7k
3
votes
2
answers
5k
views
validate file content with bash Regular Expressions
How to validate the following file content?
That should be include single integer/float number by bash Regular Expression or any other idea with awk/sed.
example:
cat /var/VERSION/...
- 423
-2
votes
2
answers
1k
views
bash + while loop with regular expression [closed]
The following loop is looping when number is less than 1 or greater than 45
but it fails when the answer includes special characters such as [ % & * # ] etc
What can I change in the code in ...
- 13.7k
1
vote
2
answers
809
views
Find works fine in command line, but won't work in script
I am trying to write a script on a Debian Jessie host.
I am having an issue with trying to run the following command (with a twist) in a script:
find ~/* -path ~/FileSniper* \
-prune -o \
-type f \( ...
- 11
-3
votes
1
answer
52
views
Regexp pattern - is it correct and what is its purpose? [closed]
Is this pattern correct?
logPattern = ^NAME.log(-\d+)?$
What is the purpose of this?
- 41
0
votes
2
answers
2k
views
Grep for regex in basename but return wholename
So say I have a list of files in a text file:
...
/foo/barfoo
/bar/foo/foobar
/foobar/bar/foo
...
I have a script that will search through this text file and, much like the locate command, I want to ...
- 103
4
votes
2
answers
2k
views
Print repeating pattern
I have a marathon file from which I want to print the names of the runners, who have made multiple runs. Something like:
M, 2:08:58.0, John Lukas, USA, 1997-07-25, Paris, France
F, 2:15:04:0, Abebbe ...
12
votes
4
answers
58k
views
Regular Expression for finding double characters in Bash
I am looking for a regular expression that finds all occurences of double characters in a text, a listing, etc. on the command line (Bash).
Main Question: Is there a simple way to look for sequences ...
- 5,120
13
votes
2
answers
45k
views
Regular expression problem(s) in Bash: [^negate] doesn't seem to work
When I execute ls /directory | grep '[^term]' in Bash I get a regular listing, as if the grep command is ignored somehow. I tried the same thing with egrep, I tried to use it with double and single ...
- 5,120
3
votes
2
answers
1k
views
perl regex replacing globally when global not selected
I'm using Ubuntu 11.04 and wrote a small script that searches within text files for certain "tokens" and replaces with some a prewritten snippet from a template file of the same name.
The text files ...
