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Top Forums Shell Programming and Scripting Truncate Specific Parts of a String Post 302395601 by cfajohnson on Tuesday 16th of February 2010 01:12:45 PM
Old 02-16-2010
Quote:
Originally Posted by royarellano
How do you truncate specific parts of a string.

Example:
1 This is the string

Goal:
This is the string

As you can see I'm trying to simply remove the first two characters of the string the number one and the space between the one and the word "this."

There is no reason to use an external command (sed, awk, cut, etc.) which is orders of magnitude slower than doing it in the shell itself.

Code:
string='1 This is the string'

## remove the first two characters:
newstring=${string#??}

## remove up to and including the first space
newstring=${string#* }



---------- Post updated at 01:12 PM ---------- Previous update was at 01:03 PM ----------

Quote:
Originally Posted by alister
That will mangle strings which contain consecutive whitespace (space, tab), since $0 is rebuilt internally using the OFS.

Code:
echo '[anything] This is    the string' | nawk  '{$1=""; sub(/^[ ]*/,"",$0)  }1'

... will print out ...

Code:
This is the string

instead of
Code:
This is    the string

Code:
echo '[anything] This is    the string' | nawk '{sub(/^[! ]* */,"",$0);print}

 

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CTYPE_SPACE(3)								 1							    CTYPE_SPACE(3)

ctype_space - Check for whitespace character(s)

SYNOPSIS
bool ctype_space (string $text) DESCRIPTION
Checks if all of the characters in the provided string, $text, creates whitespace. PARAMETERS
o $text - The tested string. RETURN VALUES
Returns TRUE if every character in $text creates some sort of white space, FALSE otherwise. Besides the blank character this also includes tab, vertical tab, line feed, carriage return and form feed characters. EXAMPLES
Example #1 A ctype_space(3) example <?php $strings = array('string1' => " ", 'string2' => " arf12", 'string3' => ' '); foreach ($strings as $name => $testcase) { if (ctype_space($testcase)) { echo "The string '$name' consists of all whitespace characters. "; } else { echo "The string '$name' does not consist of all whitespace characters. "; } } ?> The above example will output: The string 'string1' consists of all whitespace characters. The string 'string2' does not consist of all whitespace characters. The string 'string3' does not consist of all whitespace characters. NOTES
Note If an integer between -128 and 255 inclusive is provided, it is interpreted as the ASCII value of a single character (negative val- ues have 256 added in order to allow characters in the Extended ASCII range). Any other integer is interpreted as a string contain- ing the decimal digits of the integer. SEE ALSO
ctype_cntrl(3), ctype_graph(3), ctype_punct(3). PHP Documentation Group CTYPE_SPACE(3)
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