Questions tagged [string]
String manipulation: extracting a part of a string, text replacement, formatting to a given width, etc.
0
votes
3answers
57 views
Modifying a shell variable with regex (bash)
I have a shell variable for example. a="big little man". How do I use regex in bash print out the variable with only the middle word capitalized? (big LITTLE man)
I can do it by separating the ...
3
votes
3answers
72 views
How to search for a string from all the man pages
What command would show all lines containing the string “brace expansion” (ignoring case) in the man pages for Bash?
I tried man -wK . | grep "[Bb]race [Ee]xpansion" I have got series of "couldn't ...
1
vote
2answers
22 views
sed: strip enclosing square brackets
I have this file:
[default]
region = us-east-1
output = json
[profile automation]
region = us-east-1
output = json
[profile qa]
region = us-east-1
output = json
I need to extract only the profile ...
-4
votes
2answers
45 views
Finding specific string in XML file and storing in another file [closed]
Text in input file is like this
<title>
<band height="21" isSplitAllowed="true" >
<staticText>
<reportElement
x="1"
y="1"
...
0
votes
3answers
45 views
How can a conditional statement be used in a piped command? [closed]
The data being processed will follow specific patterns. In this case I'd like to isolate all characters found in the third column and return any characters found after the "-" but only if that ...
0
votes
2answers
20 views
How can I add incremental integer row in a text file using grep or awk command in linux terminal?
I have a text file which contains 10 million+ lines. The file looks like as bellow:
1902400023
1902400029
1902400031
1902400032
I wanted to add a heading, incremental ID number and a constant ...
-2
votes
1answer
33 views
Unable to search a string using more pager
I opened a file using the more pager,i was trying to find a string in this file using / as shown in the figure below,but it is saying that pattern not found even though the string i have searched is ...
-2
votes
0answers
17 views
Problem with GCC compiler [migrated]
I am using Arch Linux and when I am compiling and running the following C code,
#include <stdio.h>
#include<string.h>
int main(void) {
char s1[]="Hello";
char s2[]="World";
...
0
votes
1answer
27 views
korn shell Unable to substitute ' ' (2 quotes) with ' (single quote) in a string variable
I am trying to substitute ''2019-01-14'' to '2019-01-14' in a varible $STG.
I tried various techniques
echo ${STG//''/'}
echo $STG | sed -e s/'\'\''/'\''/g
many more none of the equations are ...
2
votes
1answer
511 views
How to grep '$$$$$'? [duplicate]
I want to check the absence of the following sequence of characters $$$$$ (i.e., 5 dollar signs) in a json file using grep as it has been used instead of comma to separate fields and I need to make ...
4
votes
3answers
72 views
Replacing all instances of string containing hyphen
Running the following command:
echo "hello-world" | tr "hello-world" "Hello World"
Returns Heddd-ddddd. I want it to return Hello World. I believe this is because tr is interpreting the SET1 ...
0
votes
1answer
52 views
Bash: Set variable equal to a string substitution [duplicate]
I'm trying to replace a substring in $1 with another, AND set it to a variable.
(saved as testStringReplacement file)
#!/bin/bash
secondString="Sara"
myString= "${1/Suzi/$secondString}"
echo "...
4
votes
2answers
114 views
What's the purpose of adding a prefix on both sides of a shell variable comparison to a string literal?
I have encountered comparisions of variables to string literals multiple times over the years which had one character prefixing the variable and the literal, e.g.
if [ "x$A" = "xtrue" ]; then
in ...
1
vote
1answer
138 views
How do I split a string into two strings?
I already know how to put h4 h7 h8 h9 h7 into an array with space as delimiter, but after that I am trying to separate the h from the numbers to compare the numbers to each other.
How can I do split ...
0
votes
1answer
31 views
Finding and replacing text when there are custom elements within [duplicate]
I have about 450 html files I need to edit. I have the directory they all are in, so that narrows things down from the perspective of searching.
What needs to be changed is a bit of known text, some ...
0
votes
1answer
23 views
bash string increase from vda to vdb in a loop
I would like to increase a string by one, for example, from vda to vdb, from vdb to vdc and so on.
I was able to do it in one of the languages in the past by doing something like:
$c="vdb"+1
and
c ...
0
votes
1answer
92 views
dollar sign inside eval string in bash
I have hundreds of sub-directories which contain a dollar sign (i.e., $)
as the 1st character in their names, each of which needs to be visited.
These sub-directories can not be renamed. The bash ...
2
votes
2answers
323 views
How to filter a string against the characters from a variable?
I am trying to remove special characters (by passing them as a variable) from a string variable below command able to remove single characters not multiple?
string=#@$AAA%*
a=#$@%* #...
5
votes
4answers
438 views
How to treat a command output as text
I need to compare a command output with a string.
This is the scenario:
pvs_var=$(pvs | grep "sdb1")
so pvs var is: /dev/sdb1 vg_name lvm2 a-- 100.00g 0
if [[ $($pvs_var | awk '{ print $2 }') = ...
2
votes
3answers
168 views
'rename' with expression|replacement with a leading '-' (hyphen|minus)
I have many files like xyz_123_foo.ext for which I would like to add -bar to the filenames at the end to result in xyz_123_foo-bar.ext. I tried:
rename . -bar. xyz_*
which resulted in:
rename: ...
0
votes
1answer
25 views
find and replace a substring and change to uppercase
I think it's best done with an example
Contents of my file
name="apple" parameter1="value1" parameter2="value2";
name="orange" parameter1="value1" parameter2="value2";
name="tea" parameter1="value1" ...
10
votes
3answers
701 views
How to POSIX-ly count the number of lines in a string variable?
I know I can do this in Bash:
wc -l <<< "${string_variable}"
Basically, everything I found involved <<< Bash operator.
But in POSIX shell, <<< is undefined, and I have ...
3
votes
1answer
166 views
Does Bash imitate Locale-Specific Translation from C?
Bash manual mentions that
3.1.2.5 Locale-Specific Translation
A double-quoted string preceded by a dollar sign (‘$’) will cause the
string to be translated according to the current locale. ...
3
votes
2answers
71 views
Prepare arguments containing quoted string in variable
In a Bash script, I call a program like this in several places:
numfmt --suffix=" B" --grouping 231210893
Where the number is different every time, but the other parameters stay the same.
I would ...
0
votes
1answer
137 views
Get string between two strings
I need to get inner text from this string [%L10n.msg('foo')%] so text between [%L10n.msg(' and ')%] so in this example I should get foo.
I found lot of examples but no one of them worked, I tried ...
1
vote
2answers
72 views
Append strings to multiple space-separated values in a variable
I have a variable VAR="XYZ YZA ZAB" declared and I would like to append some strings next to all the words in that variable.
For example:
I want to append .file1 to each space-separate substring in ...
0
votes
2answers
311 views
exact string matching for multiple strings with grep
I am looking for exact string matches for multiple strings using grep.
Lets say I want to find the following three strings in a large data file that has about 10 Million rows and 10 columns. I ...
0
votes
3answers
50 views
determine if output is string or integer
I am trying to write a script which connects to a database then run a query that returns count of rows in a table. sometimes database or table have problems and instead of an integer they return an ...
0
votes
3answers
61 views
Cut path to first four directories
I have several projects where I have to use the same command.
The projects always are in
/home/[username]/public_html/[prjectname]/
I'd like to run this command from every directory of my projects, ...
1
vote
4answers
62 views
RegEx for matching strings in 2nd and 5th columns using grep
I have a file (test.txt) that contains string such as:
name1,6.5.8.12,specs1,version1,['66.55.89.12']
name2,19.13.13.159,specs2,version2,['13.13.173.59'; '14.19.232.42']
name3,141.101.196.40,specs3,...
0
votes
2answers
45 views
How to delete text from variable after matching some pattern?
I wish to delete some text before some pattern. For example:
VAR="This is a test script text and real script text."
PATTERN="test "
And the desired output that I want is:
NEW_VAR="script text and ...
0
votes
3answers
95 views
sed command to replace and write
I am trying to replace the following string with another one from a file which contains few lines.
"schema" : "AAAAA",
TO
"schema" : "BBBBB",
Currently, I am doing the following command to get the ...
0
votes
1answer
128 views
Extract substring after delimiter using GNU awk or awk [duplicate]
I would like to extract substring after colon delimiter for my practical needs using GNU awk utility.
For example I can extract the temperature of hdd value using cut as follows
hddtemp /dev/sda | ...
0
votes
2answers
43 views
How to check if first column's string of file1 exist in the file2?
I have two files, file1.txt contains strings separated by commas:
1.1.1.1,string1,comment1
7.7.7.7,string3,comment3
2.2.2.2,string2,comment2
88.88.88.88,string4,comment4
999.999,999,999,string5,...
9
votes
2answers
829 views
Build a command dynamically
I'm working on a script and I need to build the tar command dynamically.
Here are two examples to illustrate what I'm trying to do :
#!/bin/bash
TAR_ME="/tmp"
EXCLUDE=("/tmp/hello hello" "/tmp/...
1
vote
1answer
179 views
Grep global find replace [duplicate]
Is there a way to grep for a regular expression on an Ubuntu server and then find and replace it with another string? I am using the following command right now, but it doesn't account for actually ...
-1
votes
3answers
66 views
Remove a whole line beginning with a pattern occurring anywhere after another pattern
How can I remove any line beginning with --- occurring in any line number after a line containing # Match (the first occurrence in any line number)?
EDIT:
The relationship between #Match with the ...
3
votes
5answers
470 views
Finding numbers in a command output and save it as variables
In a bash script, I wish to get some numbers from the output of a command and store them in variables. An example of the command output:
25 results [22 valid, 2 invalid, 1 undefined]
I would like to ...
4
votes
7answers
4k views
How to compare 2 strings in UNIX shell script? [duplicate]
I have a variable which stores a string, the output of a sed command.
I want to execute a set of commands only if this string value matches either of the 2 other strings.
I used the below code.
#! /...
3
votes
4answers
323 views
Extract addresses separated by semicolon and print each address in a line
I have a file with the following input. The numbers separated by dots represents addresses. Any number in address can be one or more digits as follows:
[112.112.112.112;3.3.3.3;44.44.44.44]
[6.6.6.6;...
1
vote
4answers
52 views
How to process a column's multiple strings
I have a comma separated file that looks similar to his format:
aa.com,1.21.3.4,string1 string2 K=12 K2=23 K3=45 K4=56
bb.com,5.6.7.8,string1 string2 K=66 K2=77 K3=88 K4=99
I want to take ...
2
votes
5answers
578 views
Grep specific data from string [duplicate]
Here is the data:
Valid from: Fri Nov 24 12:11:28 EST 2017 until: Sun Nov 24 12:11:28 EST 2019
Valid from: Fri Feb 24 13:21:19 EST 2017 until: Thu Feb 24 13:31:19 EST 2022
Valid from: Tue Dec 20 12:...
0
votes
2answers
165 views
Searching for URLs with subdomains using grep
I have a file with content similar to:
mail.google.com
srv1.mail.google.com
google.com
facebook.com
yahoo.com
tt.twitter.com
I want to search for lines with subdomains. I used this command:
grep -e ...
6
votes
3answers
2k views
Search for special characters using grep
I want to search for the lines that contains any of the following characters:
: / / ? # [ ] @ ! $ & ' ( ) * + , ; = %
I am familiar with grep. But with this set of characters, it is a bit tricky ...
2
votes
2answers
280 views
How to execute grep -v -e 'expr1' and grep -e 'expr2' at the same command?
I have the following command to extract string that do not start with www. and do not contain /:
grep -v -e '^www\.' -e '/' test2.txt
But I want the above in addition to matching somestring....
0
votes
3answers
643 views
How to remove filename extension from a list of filenames in bash
I am trying to remove the filename extension from a list of files I've generated with the following bash script:
#!/bin/bash
file_list=$(find . -type f) #assuming that the files are stored in the ...
0
votes
2answers
43 views
re-write a string with text and numbers onto a newline and insert text
In Short, I want to split single line output string into multiple rows and label each raw with the hostname.
Hostname ProcessName CPUCore
output=$(ssh -q -o "StrictHostKeyChecking yes" $ssh_host '...
1
vote
1answer
296 views
How to search for a pattern using grep?
I want to search a file to check for patterns like this:
text1,text2,[1.2.3,3.4.5,6.7.8,etc] exist. The number of commas inside the square brackets is undefined.
I tried the following command but it ...
3
votes
2answers
254 views
Using pipe STDOUT as a variable?
Fairly new to Bash, about a grueling week. I love it so far and really like long chaining pipes. What I'm noticing though is that I have to break the pipe if I need to use the STDOUT as a variable.
...
0
votes
4answers
35 views
How to replace the line with an exact matching of a string
I have a file with this content:
dskldfsd.com
domain
domain.com
sub.domain.com
domain.main.com
anythinghere
I want to delete the line which contains the word domain. Using grep, this command ...
