Questions tagged [string]
String manipulation: extracting a part of a string, text replacement, formatting to a given width, etc.
798
questions
2
votes
1
answer
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views
Joining 'fish shell' arguments into a single string with spaces
Sorry, this question is already answered for 'bash' here:
Joining bash arguments into single string with spaces.
in Fish, using "'$*'" leads to this error:
$* is not supported. In fish, ...
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0
votes
1
answer
40
views
What does the line ($eachJOBID = $eachScriptNoPath) =~ s/\.csh// ; do?
This line I have in my code cuts the .csh from a string and returns the rest of it. Can someone explain what each part of it does?
($eachJOBID = $eachScriptNoPath) =~ s/\.csh// ;
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2
votes
5
answers
130
views
How to remove duplicate slashes from path to a file?
I have a path to a file that has duplicate slashes which would like to simplify.
For example, if I have the following:
/opt//bin//executable
I would like to get:
/opt/bin/executable
-1
votes
1
answer
42
views
I can't grep some inputrc string
bind -p |grep -E "\\e.\":" work
but
bind -p |grep -E "\\e\\C-.\":" don't work
I tried a lot of combination
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1
vote
1
answer
56
views
GNU parallel: how to call exported bash function with empty string argument?
Scenario:
$ process(){ echo "[$1] [$2] [$3]" ; } ; export -f process
$ process "x" "" "a.txt"
[x] [] [a.txt]
Here we see that the 2nd argument is empty string ...
- 629
-1
votes
5
answers
154
views
add empty line before every line that contains certain characters
I have a lot of markdown files that contains something like this:
* header A
- item 1
- item 2
** sub-header A1
** sub-header A2
* header B
- item 1
- item 2
** sub-header B1
** sub-...
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0
votes
0
answers
60
views
Why isn't passed quoted $@ a single argument? [duplicate]
Why isn't passed quoted $@ a single argument?
f2()
{
echo "f2: $1"
}
f1()
{
local x=("$@")
f2 "${x[@]}"
}
f1 x y
Invocation:
$ bash t537.sh
f2: ...
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-1
votes
1
answer
78
views
Checking if I'm correct about the order of operations in Bash
Guten Tag! I'm a rookie in everything Bash-related. I'm familiarizing with the syntax and wanted to know if the order of operations in this command is as I thought or not.
The command:
echo 2 * 3 > ...
2
votes
1
answer
96
views
How to check what character a variable contains and compare it with a number? [closed]
I have an hour record in which subsequent hours are written from 1 to 9 as numbers and then as subsequent alphabetic characters. I would like to save the time in a normal format, so I need to convert ...
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0
votes
1
answer
52
views
Retrieve the Following Occurrence of the String 'PWD' Once the Given String is Located
Below is my sample test.log file
export SQRDIR=/v/orahome/Middleware/Oracle/bin64
export OID=ap0092
export PWD=pass1
export FDPWD=pass1
export AP0085_PWD=pass1
export SVR=AFFPROD
export ...
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1
vote
3
answers
349
views
awk print between lines when "/" is part of the name
I need to print lines between those that contain a "/" in the name.
I tried with:
awk '/+SOLUTION/ESTIMATES/,/-SOLUTION/ESTIMATES/' $F > fil$F
and
awk '/+SOLUTION"/"ESTIMATES/,/...
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-1
votes
2
answers
458
views
How does the `tr` command work?
I was playing around with tr and got some unexpected results. What is happening in these situations? I don't understand what is happening under the hood, or perhaps I'm not using this command ...
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1
vote
1
answer
182
views
How to convert all newlines to "\n" in POSIX sh strings
I have a string that contains newline characters. I want to escape all newlines in that string by replacing all newline characters with a string of two characters: "\n". How can I do this in ...
- 3,038
0
votes
1
answer
584
views
How to remove characters from end of a line till a particular character in perl
my string is like
$varin="wer.try.iuy.oiu.qert"
i wanted to remove characters starting from end of the string till "." is encountered.
expected output:
wer.try.iuy.oiu
have tried ...
0
votes
0
answers
98
views
Bash reverse search inserting characters into command after hitting tab
SYSTEM:
Ubuntu: 20.04
Kernel: 5.4.0-162-generic
bash: 5.0.17(1)
I found a strange problem that when I use bash's reverse search with CTRL+r, I will find a command I want to run. I select TAB to ...
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0
votes
1
answer
23
views
Finding on each folder if a subfolder respect the convention name according to the folder name?
i have a "sites" folder with a number of site folder named:
bu.my-url.com
dud.myurl.com
[must-be-indentical_string].myurl.com
etc
On each site folder, I'd like to check if the /themes/amu_[...
- 103
0
votes
1
answer
358
views
bash: string variable contains asterisk. how to use this variable for searching etc with grep, sed?
Have a nice day
I have got text file (zz.txt):
Chemical name
3-Aminopropane-1-sulphonic acid
Synonym(s)
--
Homotaurine * Tramiprosate
--
Chemical name
Common name and synonyms
...
I have variable
s=&...
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1
vote
2
answers
101
views
String Length Always Returns 2 in ZSH Function
I'm trying to bowdlerize email addresses in a fixed length text file by generating a random string the same length as the input. I'm passing the string as a backreference in sed.
To simplify, this ...
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0
votes
2
answers
432
views
Use SED to replace part of a current variable with user input variable
I'm trying to replace only part of the existing variable with a new user input variable as below:
#Current Variable:
gdbName=Test.MY.DOMAIN.COM <--I need to replace the "Test" (This can ...
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2
votes
2
answers
332
views
extract 2 strings from a log file
I have a log file that gets continuously populated; let's state its name is logfile.txt.
In this log file I want to continuously capture sub strings from a single line that contains other strings on ...
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2
votes
2
answers
1k
views
Tool to flatten yaml
Is there a tool to flatten yaml structure like this:
foo:
bar:
baz: true
into this:
foo.bar.baz = true
not sure what is this syntax name
context: I need this for hcl, setting a lot of values ...
- 10.1k
-4
votes
2
answers
322
views
Is it possible for any shell to interpret a string with decimal point as a number (int, float)?
This idea came to me with recent updates to Visual Studio Code, in which I usually shellcheck my code automatically as well. This is what I see, so you can get the idea:
This question is very simple ...
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0
votes
1
answer
119
views
Error in chaining multiple conditions inside a single if statement
I am working on a shell script and a part of the script should check if a file doesn't exist or if the filename provided is null (i.e. no filename has been provided).
Here is my code -
if ! [[ -e &...
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0
votes
0
answers
28
views
How can place a newline before EVERY individual character in a file? [duplicate]
Ok, I may just be having a dumbass moment. If so, I apologize.
It sounds like a fairly simple task, but I can't get this working:
I'd just like to be able to input a string, and place each individual ...
- 117
0
votes
4
answers
212
views
How to remove the superfluous "./" from a path?
Consider the following script compare_times.sh (thx to http://superuser.com/a/1780500):
#!/bin/bash
# Syntax: compare_times.sh directory_1 directory_2
# Semantics: for pairs of files with the same ...
user569950
0
votes
0
answers
36
views
Comparing a text file's unique content to expected string not registered as equal
I wrote a shell script to check which ".err" text files are empty. Some files have a specific repeated phrase, like this example file fake_error.err (blank lines intentional):
WARNING: ...
- 101
0
votes
4
answers
751
views
how to print first word from a string with multiple words without space?
I have a shell script to print appimage filenames inside a folder like this
#! /bin/bash
Dir="$HOME/Applications/"
Dir2="$HOME/Downloads/"
cd -P "$Dir"
for f in *....
1
vote
1
answer
34
views
Concatenating string passed into a control sequence
I have this echo invocation that prints a blue bar in a Bash terminal:
echo $'\e[48;2;0;0;255m \e[0m'
I would like to pass some variables to it, something like (this doesn't work):
...
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3
votes
1
answer
2k
views
How to print leading zeros (padding) in awk?
I am trying to print 99.11111 as 099.11 in AWK.
I have tried the following variations without success.
$ awk '{printf ("%000.2f\n", $1);}' <<< 99.111111
99.11
$ awk '{printf ("%...
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3
votes
1
answer
2k
views
Why does escaping double quotes from Python's run (with shell=True) is different than in Bash?
I need to produce JSON configuration files
with echo and tee called from my Python script.
By trial-and-error I've found out that I have to use single quotes.
Yet I don't understand all the behaviour ...
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2
votes
9
answers
2k
views
Why grep does not work properly in this case?
Consider a file file2.txt having the following content:
P 89 24 -1.5388040474568784e+01 7.4421775186012660e+00 -1.3143195543234219e+03 1.3168884860257754e+03 8.0419002445999993e+01 44 0 0 -97 0
P 122 -...
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1
vote
1
answer
47
views
How to extract the following strings from the file?
Consider the following data (say located in file.txt):
P 5 24 0 0 -9.0786328019999996e+02 9.1141809916739828e+02 8.0419002445999993e+01 22 0 0 -6 0
P 8 24 -3.9196518724924090e+00 2.0727804903086735e+...
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2
votes
1
answer
659
views
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 ...
- 10.5k
0
votes
1
answer
389
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:
...
3
votes
2
answers
276
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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1
vote
2
answers
102
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 ...
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0
votes
0
answers
282
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
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161
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
46
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
vote
3
answers
106
views
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
99
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
350
views
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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0
votes
1
answer
379
views
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
answers
315
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 ...
- 11
1
vote
1
answer
94
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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4
votes
1
answer
5k
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"]
- 2,949
0
votes
2
answers
233
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 ...
- 312
3
votes
3
answers
1k
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 ...
- 131
0
votes
1
answer
97
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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-1
votes
1
answer
217
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 ...
- 17