String manipulation: extracting a part of a string, text replacement, formatting to a given width, etc.

learn more… | top users | synonyms

4
votes
2answers
58 views

How to use the results of “file” (Name of Creating Application: Microsoft Word) to search for a specific string?

I am trying use the results of "file" which returns info about the file/s I specify. E.g. file *.doc 'all .doc extensions This then returns information about the file including "Name of Creating ...
0
votes
0answers
24 views

How to reference a variable by its string “name”? [duplicate]

Say for example... #!/bin/bash a1=one a2=two a3=three for x in {1..3}; { echo -n "\$a$x "; } Actual.. $a1 $a2 $a3 Expected.. one two three How can one echo, reference, call, or what ...
2
votes
2answers
56 views

Identify sub-directories that do not contain a specific string in a specific file

I have a directory named dir1 which has about 800 sub-directories named disp-001, disp-002, ... disp-800. I need to find sub-directories that either do not contain a file stdout or if they do, that ...
20
votes
8answers
3k views

How to generate a random string?

I would like to generate a random string (e.g. passwords, user names, etc.). It should be possible to specify the needed length (e.g. 13 chars). What tools can I use? (For security and privacy ...
3
votes
3answers
63 views

How do I cut a string already separated by spaces?

Lets say there's a string like this test="1/2/3 4/5/6 7/8/9/0" They are separated by spaces, as well as '/'. I want to return a result like this by taking the second field of each string segment. ...
2
votes
1answer
54 views

python Vs bash string slicing

My file a contains the text, bcd\\\\. With bash, i read the file and print characters from 4th to 8th position as, tmp=$(cat a) echo "${tmp:3:4}" It prints, \\\\ All happy. Now i use ...
17
votes
2answers
1k views

Is there something like JavaScript's “split()” in the shell?

It's very easy to use split() in JavaScript to break a string into an array. What about shell script? Say I want to do this: $ script.sh var1_var2_var3 When the user give such string ...
0
votes
1answer
105 views

RRDtool update not working when integers and floats are mixed

I'm trying to store ADSL stats for my router. I didn't do rrdtool info on the others beccause they are now showing the correct value after using the same command as in the script to update. The weird ...
1
vote
1answer
37 views

Storing integer values from string in rrd

I want to collect stats from my DSL modem every 10 minutes. According to lots of websites it's best to use rrd for this. My modem(TD-W8968) struggles with SNMP so I've made an expect script to pull ...
0
votes
1answer
41 views

Issues with storing an echo of a date conversion into a string variable inunix

Apologies but this question comes from a question previously raised: How can I convert a local date-time into UTC date-time? Toby has been absolutely great helping me with some conversion string-->BST ...
0
votes
1answer
41 views

replacing first link of a text “awk equivalent of sed command”

I wanted to replace the first line of a text with sed it should be like sed -i.bak "1 s/^.*$/"CompoundState\tMethod\tApproach\tS^2\tEnergy\tPath"/" awk.xls but I also need to run it on OSX but it ...
0
votes
0answers
40 views

Subtract a Number from variable which contains a sentence

This is extended question from http://stackoverflow.com/questions/32081168/reading-a-log-file-with-different-sequences-using-shell-script I'm new to shell. I've written a shell script a code with ...
0
votes
0answers
58 views

Concatenating two strings cuts string

I extract two numerical strings from a textfile and and want to combine them to create a new string. The new string will be a filename. This is the textfile dates.dat: 378464,2015-01-31 ...
0
votes
1answer
69 views

Grep all strings from several binary files into one txt file

I've decided to play around dumping all process memory of couple utilities in order to find out, how much trace of sensitive info an attacker could theoretically obtain from app's memory. I've found ...
0
votes
1answer
83 views

Find part of String and replace entire string in a file

I have a file named A.xml which contains a strings such as "Ticket_Release1" and "Ticket_V2". I want to find and replace all the strings in the file starting with Ticket_ with something called ...
-1
votes
1answer
61 views

Comparing folder name to line from text file

I'm attempting to compare the name of a directory to a line in a text file. However even when the name of the directory and the line in the text file are the same I can't seem to get them to be ...
1
vote
5answers
129 views

How to get all numbers out of a string and add them?

I have to parse a .xml file generated to summarize the results of a running a testSuite on some software. In a line I have, for example: <Summary failed="10" notExecuted="0" timeout="0" ...
8
votes
4answers
769 views

How to assert that a string has a newline character and, if so, remove it

I have a string that is the result of some operation I have no control over. When I print this variable using echo, I get: echo $myvar hello However, when I do if [ $myvar = "hello" ]; then ...
4
votes
3answers
154 views

Go from a String to an Array of “words” in Bash

I need to go from a string to an array where each entry is each word on that string. For example, starting with: VotePedro="Vote for Pedro" I need the array: Vote For Pedro Which I should then ...
0
votes
1answer
27 views

Remove Ubuntu strings from Mini install

I have an assignment to remove a string from Ubuntu Mini v. 15.04. How would I remove the Ubuntu String on the top? It says "Ubuntu 15.04 hostname tty1". I just want to remove Ubuntu 15.04 string. ...
0
votes
1answer
22 views

Substituting the value with spaces for a variable in bash script - the correct way

I have a compilation script that can compile the program with and without the debug symbols. I want to ask via bash prompt ( read ) the user to choose whether he wants a debug version or not with ...
2
votes
3answers
82 views

Find strings in file1, count occurrences in file2

I have file1.txt with string values such as New Drug Application Drug Product Dosing instructions I need to count how often these strings occur in file2.txt with data such as Regulatory New Drug ...
-3
votes
2answers
48 views

sed or awk to get a string

I have a shell script with string=<deploymentTargets xmi:type="appdeployment:ClusteredTarget" xmi:id="ClusteredTarget_143378365 7353" name="cluster1"/> I want the value between name=" and ...
2
votes
3answers
769 views

extract string between double quotes

I have requirement that i need to extract string using quotes. My string as follows. "abcd efgh" "ijkl mnop" "qrst uvwxyz" can you help me to get the string between second double quotes(ijkl mnop) ...
-1
votes
1answer
380 views

How create calculator in linux script?

I am trying to create a calculator: echo "What is your number?" read n1 echo "what is your second number?" read n2 echo "what do you want to do?" echo "1. add" echo "2. subtract" echo "3. divide" ...
3
votes
2answers
291 views

Substitute for loop variable in a string pattern

I am trying to iterate over an array of file names and substitute the file name inside an absolute path. The code is, #!/bin/bash jsArray=(moment.js datatable.js jquery.js jquery.tmpl.js dt_jq_ui.js ...
0
votes
1answer
122 views

Jquery like templates for formatting strings in bash

#!/bin/bash rm all for f in assets/css/*.css; do printf "<style type='text/css' >\n" >> all cat $f >> all printf "</style>\n <!-----$f---->" >> all echo "$f ...
0
votes
3answers
762 views

get value after specific word

I have this file 1 deiauk David Smith from California 12 58 2 edvin from Nevada 12 5 8 95 2 48 5 3 jaco My Name Is Jacob I'm from NY 5 6 845 156 585 4 from Miami And I need to get values after ...
2
votes
3answers
2k views

Awk: match exact string in line

I have this file a deiauk Biking US 200 G b kespaul 202 A c deiauk NY 222 5 Z And I want to match the exact string 200 using awk. So my result should be a deiauk Biking US 200 G Here's my code ...
0
votes
2answers
74 views

Search and replace with a regular expression in vi?

I would like to replace a string with regular expression that appears in multiple lines with the character "x": The problem is to replace words with the x in front that has an integer after the x, ...
1
vote
1answer
192 views

Why does bash try to execute strings in a string substitution?

My script is supposed to take input from a pipe and replace newline characters with commas, using the bash's string substitution: #! /bin/bash read -d -r input echo $input $input=${input//\n/,} ...
2
votes
2answers
106 views

Extra space with counted line number?

I count the number of lines of my file with this command on OSX: nl=$(wc -l < ~/myfile.txt) Say, nl turns out to be 100. Now, I wish to use the result nl in another command, but weirdly, echo ...
4
votes
3answers
192 views

How can I prepend and append to each member of an array?

I have an array: CATEGORIES=(one two three four) I can prepend to each array member using parameter expansion: echo ${CATEGORIES[@]/#/foo } I can append to each array member the same way: echo ...
4
votes
4answers
144 views

Stable sort a file by presence of ordered substrings on each line

I have a list of sound sources that I'm processing with a script. An example would be: alsa_input.usb-AVEO_Technology_Corp._USB2.0_Camera-02-Camera.analog-mono ...
0
votes
1answer
84 views

Parsing string on multiple parts without separator

115:wc -l:find . -iname "*test*":find /tmp/ -iname "*test*" I would like to parse the string above. In my case, a string consists of 4 columns (every command has : separator) but it can be much ...
0
votes
1answer
113 views

Take output field data string into variable

I want to grep for some specific lines from a log file, and then capture a specific part of that output in a variable and use it in other commands. The grep command I have is the following, where $1 ...
1
vote
2answers
188 views

Apply a filter to the value of a variable using backticks

Sorry for asking such a simple question, but reading about this issue on the internet has proven fruitless. I'm trying to better understand the grave/backtick operator and I've been doing okay so far ...
1
vote
1answer
1k views

Using sed to replace a string with special chars with another string with special characters

I'm trying to automate switching out a bash prompt for another in .bashrc Original String: PS1='${debian_chroot:+($debian_chroot)}\[\033[01;31m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ ' ...
1
vote
2answers
82 views

How can I properly use the 'sed' s command in this particular scenario

There's a very simple question that's been bugging me about the sed command. Reading the documentation about this command has left me confused (mostly because English isn't my primary language). So, ...
13
votes
6answers
617 views

/bin/dash: check whether $1 is a number

What would be the best way to check whether $1 is an integer in /bin/dash ? In bash, I could do: [[ $1 =~ ^([0-9]+)$ ]] But that does not seem to be POSIX compliant and dash does not support that
3
votes
2answers
613 views

how to strip the last slash of the directory path?

I have a script which requires an directory as one argument. I want to support the two form: one is like a/b/c (no slash at the end) and another is like a/b/c/ (has slash at the end). My ...
2
votes
3answers
100 views

Extract a part of a string in a bash script

I have a variable with some text in it. I need to get a specific bit of information out of it. For example I have export OUTPUT="Running \"protractor:admin\" (protractor) task Using ChromeDriver ...
2
votes
1answer
150 views

I have a multi-line string that I need to iterate over, but I'm not using bash. Advice?

I'm using Dash because this is to run on my rPi. Bash is not an option. I'm rewriting a Bash script to work with Dash. I'm hoping to make it as POSIX-compliant (portable) as possible. The thing is ...
4
votes
4answers
2k views

Split single string into character array using ONLY bash

I want to split 'hello' into h e l l o in an array using only bash, I could do it in sed with sed 's/./& /g' but I want to know how to split a string into an array in Bash when I do not know what ...
0
votes
0answers
10 views

Recursively replace a specific occurrence of a string in some files [duplicate]

Inside a folder, there are in certain files, a specific URL string (that is equal in all of them), that I need to replace with another URL string. What can I do?
4
votes
4answers
630 views

How do I extract parts of a string to variables?

I have a line from some file like this: attempting to create a 512^3 level (with Dirichlet BC) using a 16^3 grid of 32^3 boxes and 800 tasks... I want to extract the 512^3, 16^3, 32^3 and 800 four ...
0
votes
1answer
100 views

replacing multi line string with another multi line string using sed

for eg. input : // copyright package com.base import com.base import com.base ... i want to replace the pattern "// copyright\n\n^package.*" with another string i'm trying to do using sed -e ...
1
vote
1answer
106 views

List all regular files containing (in their name, directory or their content) a specific (sub)string

Like in the title, and also I want to print the number of the line in each (text) file where the substring occurs. So far I have: find /sys | grep "filesystem" But it appears to only look at the ...
-2
votes
1answer
74 views

How do I insert a character in front of a string? [closed]

For example I have QQQQQ111025 in a middle of a line. Where 1 can be any character numerical or alphabetical. I need to insert 1 in the front of the QQQQQ or I need to replace the QQQQQ with 1. Keep ...
1
vote
2answers
46 views

Problem with using expr

I've got two strings str1="( 1 + 2 + 3 + 4 + 5 ) / 3 + 5" and str2="( 1 + 2 + 3 + 4 + 5 ) / 3 + 5 * 2" The command result=` expr $str1` returns a correct value, while result=` expr $str2` ...