Questions tagged [string]
String manipulation: extracting a part of a string, text replacement, formatting to a given width, etc.
770
questions
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1
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Why doesn't ampersand (&) work in string replacement without being escaped?
The following script is really simple, and replaces & with &:
string="Foo & Bar"
echo "${string//&/&}";
But the script does nothing. There are no ...
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0
votes
1
answer
51
views
Quoting a string in output from awk
I am fetching a string from a file using awk as shown below. Now I would like to double quote it. Any support would be highly appreciated.
awk -F',' '{print $(NF)}' sample.csv| tail +2
output:
...
2
votes
2
answers
68
views
Bash function colouring from string input matching regex
I have a multi-line string that I use for printing in a bash script.
docstring="
Headings
-H, -H CNT, -H=CNT, -HCNT, --heading CNT, --heading=CNT
Warnings
-W, -W CNT, -W=CNT, -WCNT, --...
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0
votes
2
answers
31
views
Multi-line documentation for bash inspired by lisp
I want to print some usage information for some functions. I customarily use echo or printf for each line.
echo "-V, --version"
echo " Display the version number and copyrights ...
- 25
0
votes
0
answers
49
views
How does one store the evaluation of a big string with multiple env variables $VAR into another env variable?
Becuase I need to make sure I run authentication for my nohup commands I need the real command I want to run to be in a string in here:
nohup sh -c 'echo $SU_PASSWORD | /afs/cs/software/bin/reauth; ...
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0
votes
1
answer
40
views
how to detect unbalanced special characters in string
I'm wondering what would be the best way (likely using grep or ack) to return lines containing unbalanced special character sets in a string? For example, if the string were:
bqM#+t1U"OyBGhk]ozVG[...
0
votes
0
answers
28
views
Creating a script which compares the return value from an AT command
I am trying to write a shell script that can save the output of a piped process to a variable. This variable is then compared to a known string in order to discern whether or not my AT modem is ...
1
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3
answers
66
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get specific output in linux after string
Controller loading lists...
-------------------------------------------------
command: select SERVICE_NAME from <table_name>
-------------------------------------------------
...
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2
votes
2
answers
79
views
How do I convert the text to remove words with one letter?
How do I convert the text of the input stream in the following way: skip single letter words. If the word contains one number and one letter, it should also be omitted.
I have a Text1.txt file and ...
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1
vote
1
answer
47
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test returns wrong value (but no errors) depending on the presence of spaces around the operator
If there are spaces around the operator, test returns the correct value of the expression.
But if there are no spaces, it doesn't throw any syntax error and always return true.
$ test "A" == ...
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1
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28
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How can I append a specific text at the end of each line in a file?
I have a file called my_file.txt. Its content is as follows:
7rrmC
7rztC
7s63D
7scfA
7sciA
7seuA
7sh3B
7shgA
7sj9N
7sp5A
7sr2B
7stdC
7sv6A
7sybA
7t2yB
7t30B
7t3bE
7t4rA
7t71A
7t8wD
7tacA
7tbsA
7tfmA
...
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1
vote
3
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47
views
Extract file length from output of 'ls -l' passed back from sftp session
From my local server I only have access to stfp to a remote server where I want to check the size of my backup file as it's being created. So I've been able to write a bit of bash that logs in and ...
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1
vote
1
answer
76
views
How to delete a string in my files?
So I want to match all below then remove those lines of string.
[MTT-5634](https://my.atlassian.net/browse/MTT-5634)
[MCC-123](https://my.atlassian.net/browse/MCC-123)
[MTT-7965]: https://my.atlassian....
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votes
1
answer
1k
views
Convert comma separated string into json array
I have the following string in bash
"3.8,3.9,3.10"
Is there a way using shell to convert it into a json array, i.e.
["3.8", "3.9", "3.10"]
- 2,393
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votes
2
answers
66
views
Extract text from first and last strings
I want to extract text from a string matching the first and last word
string is a path :
/path/to/the/file/app.apk(randomcharacters)
and I want to extract text like
/path/to/the/file/app.apk
using ...
- 65
2
votes
1
answer
84
views
Extracting json fields in a log line using awk or some other cli tool
Here's the log format in the system that we are currently using and right now it's not easy to change the logs format through the entire system. And I need a way to extract the json object in the logs ...
- 121
0
votes
1
answer
35
views
uncomment the line upon search string while ignoring case in a file
Below is my cron file entries:
#Ansible: test2
*/15 * * * * ansible-playbook /web/playbooks/automation/detect401MORTEN/va_action.yml | tee -a /web/playbooks/automation/detect401MORTEN/cron.out
# #...
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-2
votes
1
answer
62
views
Why is my file with 10 random bytes larger than 10 bytes?
So I have generated a random string of 10 bytes using the command openssl rand -hex 10 > result. My question is why does the resulting file have a size of 21 bytes? I haven't encrypted so I am not ...
- 7
0
votes
2
answers
189
views
How do I camel case a snake-case string except for the first letter?
I'm using bash shell. I have used this to convert a string from snake case to camel case ...
$ echo "this_is_the_string" | sed -r 's/(^|_)([a-z])/\U\2/g'
ThisIsTheString
However, what if I ...
- 2,102
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0
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17
views
How to returns the correct character after manipulating the output of ps ax | grep [duplicate]
I would like to have some help writing a script (which should works on freebsd where I have sh as default) that should grab a precise character when I do a "ps ax | grep" command from the ...
- 471
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1
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37
views
How to get one line above the enabled crontab entry
I have the below crontab entries
$ crontab -l
#Cron to auto restart app1
#Ansible: test1
#*/15 * * * * ansible-playbook /web/playbooks/automation/va_action.yml
#Cron to auto restart app7
#Ansible: ...
- 417
-1
votes
2
answers
64
views
How to use the string returned by $() to be used as more than one argument in another command?
My use case:
I need to remove all dev packages listed in composer.json file. Suppose I have two packages: projectx/package-nice and projecty/package-good. To remove them I need to run:
$ composer ...
- 309
2
votes
3
answers
128
views
Why do I need eval in this example?
I'm exploring the notion of having a shell script input and output two dimensional structures of strings, with the limitation that the strings do not contain newlines. They can contain spaces.
The way ...
- 2,135
0
votes
1
answer
56
views
Parsing text using Python
I have this text;
{bc}having or marked by great {a_link|volume} or bulk {bc}{sx|large
I was trying to get something like this;
having or marked by great volume or bulk
I tried doing this with ...
- 246
0
votes
1
answer
80
views
Facing difficulties sending bytes containing white spaces python irc bot
Trying to make a basic irc bot in python (3.9.2) that can response specific commands when invoked. It works although when a response contains whitespace or a space, only the first word gets displayed ...
- 246
0
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2
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225
views
Linux search file with given name containing string recursively
From Linux shell, Let's say I'm in directory /dir and I want to find, recursively in all subfolders, all the files which contain in the name the string name_string and, inside, the string ...
- 3
0
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1
answer
49
views
Why does cat randomFile.txt mess up with my terminal? [duplicate]
I am simply generating a pseudo-random content file with.
dd if=/dev/urandom bs=1M count=1 of=./filetone.txt
To then cat it
cat ./fileone.txt
The issue is that upon completing with this command it ...
1
vote
1
answer
85
views
IP address string manipulation problem
I am trying to build three octets 10.AB.C9 from a 5 digit number: 12ABC:
12 = first octet
AB = Second octet
C = Third octet
There are two scenarios with my existing code that can cause an in correct ...
- 406
0
votes
2
answers
255
views
Awk substr index 0
I just discovered that substr() in awk accepts either 0 or 1 as the initial index in a string. I tested this in Gawk 5.1.0 and MacOS awk 20070501.
awk 'BEGIN {print substr("abcd", 0, 1)}'
...
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3
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91
views
Better way to convert IP?
I am trying to convert 10.AB.C9.XYZ to 10.AB.C2.252.
Right now I am extracting each character and piecing them together.
ip_main=10.AB.C9.XYZ
A_char=${ip_main:3:1}
B_char=${ip_main:4:1}
C_char=${...
- 406
0
votes
2
answers
88
views
How to correctly line break and concatenate a string in a bash script
I have a Bash script with a function to log messages with time and status, and I want to keep my script 80 column only:
#!/bin/bash
log_message() {
echo "[$(date)]-[$1] : $2" >> log....
- 752
0
votes
1
answer
93
views
Remove certain words and set word at end of string in files
I have a bunch of files that contain strings similar to:
Get<1>(abc)
Get<2>(xyz)
How can I recursively search for all files with the above pattern and remove everything before the first '(...
- 101
0
votes
1
answer
24
views
Loop that replaces a string only once each time after reading a different string
I'm trying to edit a mod that changes regularly (I'm trying to turn all characters into adults), and in some of the files I need to run a script that finds a specific line like "character = yes&...
- 1
0
votes
1
answer
346
views
Run cargo command in subdirectories with user-specified arguments
I've a directory structure like:
rust/
├── dir1/
│ └── Cargo.toml
└── dir2/
└── Cargo.toml
I want to create a zsh script that'll run from the rust directory, and for each subdirectory with a ...
- 103
0
votes
1
answer
33
views
String compare negating in bash doesn't behave as it should be?
I have this little bash script:
readonly imagick_extension=$(cat "${php_configuration_file}" | grep imagick)
echo "Imagick extension grep value: $imagick_extension"
if [ "${...
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0
votes
2
answers
836
views
Rookie Question: Regex in ZSH Script
I think my problem is very simple. I want to construct a new filename, which has a fixed prefix and a number (two digits), which is part of the old filename.
Example: I have a file 'blableblub23.pdf' ...
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1
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0
answers
77
views
How to change 2 words in a string in BASH where there will be a ":" in one of them
I have worked my best on trying to make a script to iterate thorugh 2 Arrays.
The values in each Array needs to get its value input into a string called ExecuteSyncoid based on a string called ...
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1
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2
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2k
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split string using a substring as delimiter and get the later part
Here is my string LIBRARY_TRGT_CANV,CANV_MATCH<anything>
I wish to get all the text after last occurance of our delimiter which is _TRGT_:
Desired output:
CANV,CANV_MATCH<anything>
------ ...
- 417
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1
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81
views
Need help Formatting a file having key: value [duplicate]
I have a file having the below values:
cat data.txt
server1: 'calv'
server2: 'anot'
log: '/u/log/1'
server3: 'calv'
server4: 'anot'
server5: 'secd'
server6: 'calv'
LIB_TRGT_calv,anot: '/tmp/hello.txt'
...
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-1
votes
3
answers
220
views
Need to format text file and update based of key value format
I have a file having the below values:
cat data.txt
server1: calv
server2: anot
log: /u/log/1
server3: calv
server4: anot
server5: secd
server6: calv
LIB_TRGT_calv,anot: /tmp/hello.txt
LIB_TRGT_secd: /...
- 417
0
votes
3
answers
2k
views
bash insert backslash for every slash in string
I have a string that is a path:
/tmp/something
I need to escape the forward slashes with backslashes:
\/tmp\/something
How can I do this? Maybe sed?
Please point me in the right direction.
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2
answers
98
views
grep results with spaces and special chars
I am trying to grab results from lshw and add them to a a bash array so I can create a new string. I am using
lshw -class disk |egrep -A 7 .'-d' |grep 'product' |cut -b 17-
the output looks like this
...
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votes
0
answers
19
views
String concatenation failing after personal access token [duplicate]
What specific syntax needs to be changed in the commands below in order for the end result of the commands to produce the expected value of https://ghp_fyrwTOKEN_REDACTEDgugg@github.com/...
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1
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3
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308
views
Encapsulate only comma-separated strings in quotes
I have some data that is currently in TSV format, but needs to be converted into CSV format. The only problem is that occasionally in the TSV, there are some values that include commas that are not ...
- 13
0
votes
1
answer
1k
views
How to split a key-value string into array pairs?
How can I split the following String into key-value pairs using bash?
SOURCE="'key1=val 1' 'key2=val 2'"
My output goal is:
key1=val 1
key2=val 2
I can only input a single String as a ...
- 349
3
votes
1
answer
145
views
Recursively renaming apostrophs ' in filenames (Bash)
Need to remove apostrophes from files. I have tried several approaches, also from Stackexchange.
I am on a Synology NAS, so I don't have Python, or Perl and furthermore I have to exclude certain ...
- 307
-1
votes
1
answer
47
views
Search & replace for a string separated by whitespace upon substring match found
Below is a sample file content:
cat sample.txt
-server -XX:+UseParallelGC -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+AggressiveHeap -XX:+PrintHeapAtGC -Djava.util.logging.FileHandler....
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-1
votes
5
answers
511
views
How to make sure that the last character of each line of a file ends with single quote character
I have a file which has several lines.
I wish to update the file while making sure that the last visible character of each line of the file is a single quote '. In case not, then we should add the ...
- 417
0
votes
1
answer
570
views
How to add single quote at the end of ONLY the last line of a file [duplicate]
I want a non-perl solution where I should be able to append a single quote ' at the last visible (non-escape characters) line of a file and save it back to the file.
cat example.txt
var1: 'funn'
var2: ...
- 417
1
vote
3
answers
2k
views
if-statement with ((...)) string comparison not working in a bash script
I have written below script:
#!/usr/bin/bash
STR_1="nfosys"
STR_2="Infosys"
if (( $STR_1 == $STR_2 ))
then
echo "Strings are equal"
else
echo "...
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