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

learn more… | top users | synonyms

0
votes
2answers
512 views

search fitting ipv6 address for MAC-Address in neighbours

I have a list of possible to ip6 addresses converted MAC-addresses, that could be found in the output of ping6 ff02::1%wlan0 possible mac addresses are for example: 66:70:02:75:80:fe, ...
2
votes
1answer
471 views

shell parameter substitution to rename files

I need to rename filenames which starts with "foo" into "boo" This is the script I used #!/bin/sh for f in *.jpg; do mv -- "{$f}" "${f/foo/boo}"; done but when i run I get a bad substitution ...
3
votes
2answers
3k views

Testing a string containing only spaces (tabs, or “ ”)? [duplicate]

My code below doesn't work: stringZ=" " if [[ "$stringZ" == ^[[:blank:]][[:blank:]]*$ ]];then echo string is blank else echo string is not blank fi Result: string is not blank # wrong ...
6
votes
4answers
20k views

How to get the first word of a string?

When I 'echo *' I get the following output: file1 file2 file3 ... What I want is to pick out the first word. How can I proceed?
1
vote
3answers
938 views

Extract the base file name from a URL

url=http://www.foo.bar/file.ext; echo ${url##/*} I expected this code to print file.ext, but it prints the whole URL. Why? How can I extract the file name?
8
votes
2answers
12k views

Extracting a string, according to a pattern, in a bash script

In bash, suppose that I have a string strname: strname="ph7go04325r" I would like to extract the characters between the first "3" character and the last "r" character in strname, saving the result ...
2
votes
5answers
2k views

Test if a string has a period in it with bash

I want to run a bash command on output from Drupal's drush command-line interface. drush site-alias returns a list of webroots, first showing the name of the group, and then each site in that group. ...
10
votes
5answers
2k views

Pattern matching on path names in bash

I want to act on a list of subdirectories in a directory. Consider: for x in x86-headers/*/C/populate.sh; do echo $x; done This gives x86-headers/elf/C/populate.sh x86-headers/gl/C/populate.sh ...
1
vote
2answers
3k views

Pattern matching from the input arguments

we're trying to enhance the scripts. Users will pass some arguments and part of the arguments will have 5.0.3 For an example the input argument would be like Jboss5.0.3GA. Since it ( Jboss5.0.3GA ) ...
2
votes
2answers
177 views

Bash variables and types

I'm making a script that validate an IP address. I do this: read pool checkIp() { local ip=$1 local stat=1 if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then ...
0
votes
1answer
167 views

Alter path of find result [duplicate]

Possible Duplicate: Manipulate file name piped from find command How can I alter the path of a file found with find before I run an exec on it? I want to find files and then mv them to a ...
1
vote
2answers
3k views

How to correctly concatenate strings in shells script?

I have a bash shell which I need to modify, and I have to set a variable in a script and then call another script. My variable, EXTRA_JAVA_OPTIONS must be -javaagent:myagent.jar="-d 0 -i 1000 -l log2 ...
7
votes
3answers
5k views

How to defer variable expansion

I was wanting to initialize some strings at the top of my script with variables that have no yet been set, such as: str1='I went to ${PLACE} and saw ${EVENT}' str2='If you do ${ACTION} you will ...
2
votes
2answers
916 views

Search and replacing a string on specific file extensions

I have this bash: replace="s/AAAA/BBBB/g"; find myDirectory/. -type f -print0 | xargs -0 sed -i $replace; that will recursively scan myDirectory tree and replace all occurrences of AAAA with ...
2
votes
3answers
1k views

How to reverse-match a string in the Vim programming language?

I want to find the last index of any character in the [abc] set in the abcabc string but the search should start from the end of the string: " Returns the 0th index but I want the 5th. let ...
2
votes
2answers
98 views

Filtering the Xth element in a row?

For example, I want to get only the 3rd element in each row when I call: xinput --list --short|grep "slave pointer" I get the output: ⎜ ↳ Virtual core XTEST pointer id=4 ...
15
votes
4answers
53k views

Splitting string by the first occurrence of a delimiter

I have a string in the next format id;some text here with possible ; inside and want to split it to 2 strings by first occurrence of the ;. So, it should be: id and some text here with possible ; ...
9
votes
1answer
18k views

bash - how to uppercase the command line argument?

I searched SO and found that to uppercase a string following would work str="Some string" echo ${str^^} But I tried to do a similar thing on a command-line argument, which gave me the following ...
1
vote
3answers
10k views

bash string to int

Here is what I tried doing: #!/bin/sh res=`df | awk 'FNR == 2 { print $5 }'` res2=$((res+0)) Here is my error: -bash: 53%: syntax error: operand expected (error token is "%") I Googled ...
3
votes
3answers
692 views

Find word in sentence with Bourne Shell (sh)

I'm trying to determine if a particular word appears in a sentence using Bourne Shell (sh). For example: #!/bin/bash INPUT='Lorem ipsum dolor sit amet.' if [[ "$INPUT" == *dolor* ]] then echo ...
1
vote
1answer
162 views

awk extended pattern matching (embedding pattern matching in actions for already matched strings) [closed]

I want handle strings of the form: PREFIX_TYPE_N,DATA So, does the *awk (gawk, mawk, nawk) support including pattern matching in the action for already matched string? Something like this (of ...
1
vote
4answers
2k views

Appending a string containing escape character with sed

Currently I use: sed -i -e "5a\\ ${text}" $filename to append something to a certain line, where the variable text contains a string such as "\epsilon". When using echo -E $text the string is ...
1
vote
2answers
925 views

How to capitalize word (i.e. first letter to upper) in KornShell

Is there a builtin way in KornShell to capitalize a word, e.g. korn -> Korn? A Bash 4 example to clarify: str='korn' echo "${str^}" If there is not a bultin way to do this in KornShell, what is the ...
2
votes
4answers
711 views

Stripping all vowels but the first from a set of strings

I have a string comprised of multiple substrings, separated by underscores. For example: AbcdAEfd_hEgdgE_AbAAAAA. I need to remove all vowels except the first from each substring. So: AbcdAEfd -> ...
3
votes
2answers
737 views

remove only specific text occurrences from string using sed

I have a text file that contains many rows of this sort of thing: /*[17:51:27][1 ms]*/ UPDATE `country` SET `region_id` = '4' WHERE `country_id` = '36'; Is there a way that I can use sed to remove ...
3
votes
2answers
528 views

Change string occurrences in file while respecting DOS new line sequences

I use Visual Studio for my C# development while using Cygwin for some of the tasks that require scripting. Recently I wanted to change all occurrences of string AAA to BBB in my project's files. I ...
2
votes
2answers
2k views

How to remove error messages when searching recursively for a string?

I use find -type f -print0 | xargs -0 -n 10 grep -i searchstring to search recursively for a string. But it also gives me error messages like "permission denied". How can I avoid such error messages ...
5
votes
2answers
2k views

Splitting bash command line argument

Is this the best way to split up a colon separated bash command line argument? #!/bin/bash hostlist=`echo $1| awk '{split($0,Ip,":")} END{for (var in Ip) print Ip[var];}'` for host in $hostlist do ...
4
votes
4answers
1k views

Replace whole line in a file from command-line

I have a text file which has some contents similar to this: # General information about the project. project = u'Py6S' copyright = u'2012, Robin Wilson' # The version info for the project you're ...
1
vote
1answer
2k views

How to assign value of variable with regex (bash)?

I want to use regex in bash at line of variable assignment e.g. oldip="14\.130\.31\.172" oldip_a="14.130.31.172" << How to use regex to del all '\'? and assign to oldip_a Do you have any ...
3
votes
3answers
1k views

Extracting text from a text file in bash

I have a large text file that is all one line. In the text are several sections that looks like foo=12345 and I need to extract them all as separate lines, ignoring the rest of the file. For ...
1
vote
2answers
349 views

Variable name from command output

I have some string, and want to split on colon ":" assigning on variable with name from left part and value from right part. For example: echo "Title: Some title" | sed 's/:.*//' gives me wanted ...
2
votes
2answers
1k views

Checking if PATH contains $HOME/mydir and adding it if not (all in a script) [duplicate]

Possible Duplicate: keep duplicates out of $PATH on source I am not an expert with Unix scripting. Some of my scripts are located in $HOME/mydir. Unfortunately, they are not accessible from ...
8
votes
3answers
13k views

How to discover a new line using a for loop?

In various places around the web I've found: \015 \012 \x0a - hex \n \r all as synonyms for various newlines / carriage returns... But in this small script I cannot recognise when I come across a ...
2
votes
1answer
534 views

Replace complex string in several files

A hacker got into a web server and added this string (removed some characters for security purposes and added line breaks for readability) in all index.php files: <?php ...
5
votes
3answers
5k views

Most common encoding for strings in C++ in Linux (and Unix?)

For creating a C++ program that is source code level portable between Windows and Linux and handles internationalization well, there are IMHO three main encodings to consider: The encoding of the ...
2
votes
4answers
312 views

Generate lists of page numbers for 2-up duplex printing: 2,3,… and 1,4,…

How can I generate the following increments? 2,3,6,7,10,11,14,15,18,19,22,23,26,27,30,31,34,35,38,39,42,43,46,47,...,135 and ...
7
votes
7answers
3k views

Bash - Continuous String Manipulation

#!/bin/bash FILE="$(basename "$1")" FILE="${FILE/%.jpeg/.jpg}" Is there anyway to glue these two lines together into a one-liner?
2
votes
3answers
4k views

Bash string replace multiple chars with one

I'm replacing, from a feed title, all chars except letters and digits with a dash to use the result as a safe filename for any filesystem: $ t="Episodie 06: No hope of riding home (NEW) - Advanced ...
1
vote
1answer
341 views

Check a bash variable against a file

I have a bash variable ($HTTP_COOKIE) which contains a string. I want to check if this string matches the content of a given file (token). I'm working on a busybox linux. How should I do?
3
votes
3answers
4k views

How to pass a string parameter on bash function?

I have this code that does work: get_parameter () { echo "$query" | sed -n 's/^.*name=\([^&]*\).*$/\1/p' | sed "s/%20/ /g" } But I want to replace the "name" with the parameter that I pass ...
2
votes
3answers
178 views

expr help - managing strings

I need to take text like this: A234321=http://www.google..... a normal URL And pull out only the URL, getting rid of the first part. I think I can use expr to do it, but I can't figure out the ...
6
votes
2answers
4k views

grep surrounding characters of a match

I'm looking to do a find and replace within a giant database dump, and it's not doing what I think should happen. I'd like to grep for my target string in the file, and then see the surrounding 8 ...
2
votes
3answers
171 views

How to pass lines from a file to a bash script, so that each line remains undivided, even if there are spaces?

Given: $ cat lines.txt a/b 'c/d e/f' $ cat 1.sh #!/bin/sh ./2.sh `cat lines.txt` $ cat 2.sh #!/bin/sh echo p1=$1 echo p2=$2 echo p3=$3 $ ./1.sh p1=a/b p2='c/d p3=e/f' How do I change lines.txt ...
3
votes
2answers
192 views

filename with no spaces from two command lines

I am running two Linux commands and I want to put the resulting values together in a filename with no spaces and a dot separating the two values. So far, I've got this: pid=`sudo dmidecode -s ...
4
votes
2answers
12k views

Bash shell script to locate and remove substring within a filename

I am trying to write a bash shell script in Mac OS X 10.6 (which is called by an Automator Action) to rename TV show DVD rips that I have named badly over the years. I want to remove part of the text ...
2
votes
1answer
1k views

Need help converting a string from a file into a date

I'm trying to read a string from a file and then convert it into a date but for some reason it's failing. I'm actually modifying a GeekTool Geeklet that's not working at the moment. It reads a file ...
8
votes
4answers
2k views

How do I find the overlap of two strings in bash? [closed]

I have two strings. For the sake of the example they are set like this: string1="test toast" string2="test test" What I want is to find the overlap starting at the beginning of the strings. With ...
5
votes
2answers
2k views

Utility to get binary representation from string?

Is there a simple utility like printf that'll give me a "binary representation", i.e. a string like "01010010", from an input string? It would need to support multi-byte encodings.
4
votes
3answers
2k views

Is there a tr for translating into longer strings?

tr is great for translating a set of characters to another set of characters. Sometimes, I want to translate a set of characters to a set of strings, e.g. all < and > to &lt; and &gt;. ...