Questions tagged [string]
String manipulation: extracting a part of a string, text replacement, formatting to a given width, etc.
683
questions
-4
votes
2answers
123 views
random output from input
Related question : how to create a random output from users input
I was thinking to take an input(only one argument) from user just like Hello. And, I want to give output like
olleho
llohe
he
llo
lo
...
1
vote
1answer
55 views
How to get string between starting with X to ending with Y using Shell
I have dynamic string which are mentioned below, where I want to get ABCXXX.XXX.XXX string till , character. Starting character is fix (ABC)CAPITAL ONLY and ending also fix com or Xcom.
String can be ...
0
votes
1answer
24 views
How remove from first till a certain string in array
How do we remove from first till a certain string in array just like that of in plain string by ${..#..} e.g. ${s#abc}
$ s=(e u i o foo a)
$ t=(${s[@]#*foo})
$ echo "${t[@]}"
e u i o a
...
2
votes
2answers
173 views
Vendor from MAC address (first three parts)
How you can get the first three parts from MAC address?
$ mac=11:22:33:44:55:66
$ vendor=${${mac//:/}:0:6}
bash: ${${mac//:/}:0:6}: bad substitution
${mac//:/} removes : and :0:6 should get the first ...
6
votes
1answer
386 views
How to check if variable contains valid UTF-8 string without any control characters?
How can I check in bash whether a variable contains a valid UTF-8 string without any special control characters (such as newline or backspace or carriage return etc.)?
0
votes
1answer
22 views
Why xargs -0 adds an extra blank line?
In the example, why xargs -0 adds an extra blank line, and how to avoid it?
$ touch a b c
$ find . -print0
../a./c./b
$ find . -print0 | sort --zero-terminated | xargs -0
. ./a ./b ./c
$ find . -...
1
vote
2answers
41 views
Grep opposite option of “-o” (Not -v)
I'd like to print only the part of string that doesn't match. Is there an opposite option of grep -o? Not grep -v because it ignores the string containing pattern completely.
Lets say I have:
setenv ...
5
votes
2answers
546 views
Bash: value too great for base when using a date as array key
I have read about specifying "10#", but I don't think it's my case as I am not doing number comparison. I am trying to create an associative array in Bash, and the code worked fine until ...
3
votes
3answers
102 views
When piping from another command, limit the original pattern space to the matched string
I have a text file where I want to replace all spaces inside [[ and ]] with hyphens (brackets are never nested and always matched). The following is an example:
$ cat test.txt
abc [[foo]] xyz
abc [[...
0
votes
0answers
27 views
String comparison in Bash scripting [duplicate]
Are the following conditional expressions / commands do same in bash scripting for string comparison?
if [[ "str1" == "str2" ]]
if [[ "str1" = "str2" ]]
if [ &...
2
votes
1answer
208 views
Bash removes first character in for loop
I have the following code snippet:
#!/bin/bash
IFS='\r\n'
vconsole="pts"
for entry in $(last -n 10)
do
if [ -z $entry ]
then
continue
fi
if [ &...
1
vote
2answers
298 views
Split string on newline and write it into array using read
Given string foo, I want to store each of its field seperated by \n into elements of array bar. And I want to do this using read command, or any other command that is compatible with older versions of ...
-2
votes
2answers
53 views
Bash: How to extract portion from the end of a line that's in a variable?
In the context of a bash script, how do I extract the uniqueID from the uniqueID_db.dat part of URLs such as these, where the uniqueID can be anything, for example:
https://cdn.somedomain.com/fetch/...
0
votes
3answers
94 views
How do i use variable's value as a dynamic variable name?
i've been looking around for this all over, but either i don't know how to ask the question correctly, or it's not a common enough issue...
In PHP this is (almost) trivial:
function getSite(string $...
-1
votes
2answers
63 views
How to replace duplicate occurrences of a variable in a string? [closed]
I have a block of code that looks like this:
DIV='_'
STRING=’1__2__3__4__5'
echo $STRING
The result is:
1__2__3__4__5
I would like the result to look like this:
1_2_3_4_5
Since this is a snippet ...
0
votes
0answers
24 views
More efficient method to grab one word from string based on an index?
I'm trying to write a Bash completion script which doesn't break in the presence of colons. To do this, I'm using COMP_LINE to determine the string for the command, and COMP_POINT as the index of ...
0
votes
0answers
26 views
Let shell/terminal paste by replacing newline with space
How do I paste into a shell or terminal and simultaneously replace every newline with a space?
0
votes
1answer
29 views
find cannot do on having space within string variable for -path or -iregex or etc
Cannot have space within string variable for -path or -iregex find's option.
This input '/home/demo.*/\.config/File System/.*t$'
is fed on:
read i
m="-iregex $i"
find ~ $m
won't work as ...
1
vote
1answer
35 views
Match contents of first file with second to generate third file
Sample data of my first file first.txt is below:
10.0.0.1,Web Server,comments1,jboss is older version,myappcode1
10.0.0.3,Web Server,comments4,httpd is latest version,myappcode15
10.0.0.7,Web Server,...
3
votes
3answers
226 views
Set IFS to two bytes value in Bash
How to set IFS to two bytes value in Bash ?
IFS=',;'
will delimit each part of which resides between two simple , and/or simple ; instead of ,; as a delimiter
How is emulated/workaround way, so that ...
0
votes
2answers
86 views
bash: extract only the part of the string following the dot
Say I have a string such as
="/home/Rob/.SpaceVim"
and I want to extract the string following the dot. How do I do this?
I know $ is also used to represent the last character, and \ can be ...
4
votes
1answer
2k views
How to split a string by ':' character in bash/zsh?
I am searching for a way to split a string (variable) by : character, in a compatible way between bash and zsh.
From different sources, I found the following command:
str="part1=part2=part3"
...
0
votes
0answers
13 views
How to substitute a string on the same line of the regex searched string in Ansible
Here is my Test String test.txt:
hello
user1 ALL=(ALL) NOPASSWD: /usr/bin/* /app/tomcat/tomcat*/webapps/*, /usr/bin/rm -rf /app/tomcat/tomcat*/webapps/*,/bin/rm -rf /app/tomcat/tomcat*/webapps/**.sh ,...
1
vote
1answer
64 views
Compare strings with different encodings
I'm trying to compare a string from a file that is encoded in UTF8
file /dev/eeprom: UTF-8 Unicode text, with very long lines
with a serial number that is hardcoded into the script.
When printing to ...
2
votes
3answers
205 views
Padding unicode strings with bash's printf
I tried padding a Unicode string with bash's printf, and saw that, while
printf "%2s" a
yields the expected " a",
a Unicode variant
printf "%2s" ä
yields a ...
0
votes
1answer
41 views
convert directory names with german 'now' date to YYYY-MM-DD
I exported pictures from mac's iPhoto. The directories are named with the date in local naming ("Day. MONTH YYYY"):
8. Mai 2013/
13. Juli 2013/
31. Oktober 2014/
and some of them with GPS ...
0
votes
2answers
67 views
Unable to construct command from the output of ps
I wish to get the httpd process and then get the bin\apachectl command/file -v output
Output:
ps -eo cmd | grep httpd | grep -v grep
/home/myapache/app/httpd/bin/httpd -k start
/home/myapache/app/...
-1
votes
1answer
33 views
Replace certain strings
I've got a text file containing the following:
yyyy-mm-dd, 12:34/s-show/...
yyyy-mm-dd, 13:24/s-show/...
yyyy-mm-dd, 14:32/s-show/...
yyyy-mm-dd/s-show
Now I'd like to replace the substrings before /...
2
votes
1answer
210 views
zsh: Read from stdin until a string delimiter
I want to read from stdin until a string delimiter MARKER=$'\0'"BRISH_MARKER" is encountered. I tried:
❯ unset br ; print -rn -- hi${MARKER}world | { IFS= read -d "$MARKER" -r ...
0
votes
1answer
39 views
Use string substitution to combine array? [duplicate]
I'm trying to use string substitution to combine an array. Output:
a,b,c
The below works, but isn't there a way to do with without piping?
#!/bin/bash
words=(a b c)
echo "${words[@]}" | ...
0
votes
3answers
172 views
How to convert a kubernetes style time elapsed into seconds so I can do some comparisons
From
kubectl get pods -o wide
The output looks similar to
some-pod-name-with-numbers-123 1/1 Running 0 6d4h 192.168.0.23 node-name-abcdeft-host.domain <none> ...
2
votes
5answers
341 views
Using output of expression in bash string slicing
I want to extract a substring of a filename from a path of unknown length. I can do these two parts separately, but I wonder if there is a way to combine the two without a temporary variable?
...
6
votes
3answers
349 views
Most robust way to list every basename in a directory, sorted by modification date?
Given a directory containing:
note 1.txt, last modified yesterday
note 2.txt, last modified the day before yesterday
note 3.txt, last modified today
What is the best way to fetch the array note 3 ...
0
votes
4answers
88 views
how can extract single character before the number in a string
I have a list that contains the names of hosts available in our company.
For example :
gswast03
gkjbossp1
frdwop04
The last characters t, p, q before the number represent the environment of the host....
0
votes
1answer
124 views
How to espace sequence of characters in sed?
I am new to regex and running into some frustrations. I am trying to work with strings that express directories and am having the issue reproducible by running:
echo "a" | sed "s/a/home/...
0
votes
1answer
33 views
Print Multiple Substrings Including an IP Address
Good day!
I have a giant input file that displays a lot of garbage and I would like to export multiple substrings. The problem is that sometimes additional information is injected into the file making ...
1
vote
2answers
55 views
Using a variable within a string
I'm stuck on a problem. I am a biologist who uses linux for automation so I don't have the best programming background and would appreciate your help.
I have a large text file, containing several ...
4
votes
2answers
183 views
Using sed to replace between a specific pattern
I've been trying with sed, and googling for the whole morning, and I can't seem to get this to work.
Is it possible with sed to lowercase text between two specific characters:
i.e.
SOMENAME=WOODSTOCK,
...
0
votes
2answers
45 views
finding multiple strings in a line
I'm brand new to Unix and am using CygWIN64 simulator. I have a huge number of text files (tens of thousands) that I need to search for specific strings. I have had success teaching myself to search ...
0
votes
2answers
1k views
How to properly encode string based on json file?
I have the following basic.json file:
{
"user": "user",
"pass": "password"
}
I'm trying to encode it in base64 like this:
"Basic dXNlcjpwYXNzd29yZA=="
I think I'm close:
echo Basic $(echo ...
0
votes
2answers
39 views
Replace underline in multiple XML files
In a directory with several XML files (there may be hundreds of files) I have a field called <import_url>. In this field it can happen that a URL has an underscore.
I would like this underscore ...
0
votes
2answers
57 views
Replace first word keeping file alignment
I am trying to write a Shell script to edit an input file. Data is structured in the input file as follow:
1000␣␣␣␣␣␣␣␣␣␣␣␣: final time
1000 : print time
0.1 : time step
The ...
0
votes
1answer
31 views
Output file blows up when trying to find strings on bash on ubuntu on windows
I'm using Bash on Ubuntu on Windows to run linux commands on my windows system. It seems to work just like Ubuntu so for all intents and purposes I'm on ubuntu here I guess.
I'm trying to use strings ...
1
vote
1answer
2k views
diff command to compare 2 strings?
According to https://www.computerhope.com/unix/udiff.htm
The diff command analyzes two files and prints the lines that are
different.
Can I use the same diff command to compare two strings?
...
0
votes
2answers
38 views
Find capitalised lowercase string and put before uppercase string
I have a bash script reading names from a webpage as variables, which use the format LASTNAME Firstname:
SANCHEZ Rick
SMITH Morty
VAN SOMETHING Halen
However, I need to display each name as ...
0
votes
0answers
14 views
`zsh` and `bash` handle command output differently [duplicate]
In zsh:
% RESPONSE=$(ping -c 1 raspberrypi4b.local)
% echo $RESPONSE | grep "% packet loss"
1 packets transmitted, 1 packets received, 0.0% packet loss
But in bash it's different:
$ RESPONSE=$(...
0
votes
1answer
537 views
How to target and shorten a long string in bash with “…”
I'm doing some web development and I am printing out some object data in the console. I want to target one property/field denoted in output as dataURI: DFASDFKAJELKJDFSADFMLAKFJLSKDJFAJSDFL which is a ...
1
vote
3answers
829 views
String manipulation with curly brackets in bash
I have a string from a latex file that I would like to work on:
\title{This is the title}
I would like to save "This is the title" in a variable, but cannot manage to remove the substrings with the ...
1
vote
1answer
61 views
Zsh, splitting the expansion of %~
I'm at my wits end with this. I'm using zsh and trying to simply split the expansion of %3~ on the / character. This works fine with the expansion of $(pwd) and $PWD - both of which are also path-like ...
0
votes
2answers
623 views
How to safely escape a variable string (user input) in bash?
I have a very simple chat-like tool that runs within a GNU screen session. The screen window is split, the top part is running tail -f file.txt and the bottom part is running a script with the ...
