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

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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 ...
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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 ...
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Reading a string till a key word and replacing from there with another string

I am new to UNIX and am practising shell scripting. I have an application where I need string searching and replacement. There are some lines in a file 1 and file 2. I have a search key word. If the ...
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Finding words with one vowel group

I am trying to use a command to find all words in a list of words with one group vowels. Like four, for and far, but also words like ore and or. What I got so far: grep -i ...
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Generate array of strings combined with number

I would like to generate a local array in a shell/bash script that consists of the following elements: JF-1998, JF-1999, JF-2000,... , JF-2011. That is, a string JF- combined with the years from 1998 ...
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Automatic replacement of strings in gedit

I want to replace some strings defined by me in gedit, after a word has been completed and/or the document has been saved. For example \├░rac should be replaced with \frac How do I do this in gedit or ...
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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 ...
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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 ...