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Top Forums Shell Programming and Scripting Strip leading and trailing spaces only in a shell variable with embedded spaces Post 65567 by jerardfjay on Monday 7th of March 2005 10:14:17 AM
Old 03-07-2005
Bug Strip leading and trailing spaces only in a shell variable with embedded spaces

I am trying to strip all leading and trailing spaces of a shell variable using either awk or sed or any other utility, however unscuccessful and need your help.

echo $SH_VAR | command_line Syntax.

The SH_VAR contains embedded spaces which needs to be preserved. I need only for the leading and trailing spaces to be removed. If anyone has accomplished this before or knows a quick way to achieve this result please let me know

Thnx Smilie
 

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NetSDS::Util::String(3pm)				User Contributed Perl Documentation				 NetSDS::Util::String(3pm)

NAME
NetSDS::Util::String - string prcessing routines SYNOPSIS
use NetSDS::Util::String qw(); # Read from standard input my $string = <STDIN>; # Encode string to internal structure $string = string_encode($tring); DESCRIPTION
"NetSDS::Util::String" module contains functions may be used to quickly solve string processing tasks like parsing, recoding, formatting. As in other NetSDS modules standard encoding is UTF-8. EXPORTED FUNCTIONS
str_encode($str[, $encoding]) - encode string to internal UTF-8 By default this function treat first argument as byte string in UTF-8 and return it's internal Unicode representation. In case of external character set isn't UTF-8 it should be added as second argument of function. # Convert UTF-8 byte string to internal Unicode representation $uni_string = str_encode($byte_string); # Convert KOI8-U byte string to internal $uni_string = str_encode($koi8_string, 'KOI8-U'); After "str_encode()" it's possible to process this string correctly including regular expressions. All characters will be understood as UTF-8 symbols instead of byte sequences. str_decode($str[, $encoding]) - decode internal UTF-8 to byte string By default this function treat first argument as string in internal UTF-8 and return it in byte string (external) representation. In case of external character set isn't UTF-8 it should be added as second argument of function. # Get UTF-8 byte string from internal Unicode representation $byte_string = str_decode($uni_string); # Convert to KOI8-U byte string from internal Unicode $koi8_string = str_encode($uni_string, 'KOI8-U'); It's recommended to use "str_encode()" when preparing data for communication with external systems (especially networking). str_recode($str, $FROM_ENC[, $TO_ENC]) - recode string Translate string between different encodings. If target encoding is not set UTF-8 used as default one. str_trim($str) - remove leading/trailing space characters $orig_str = " string with spaces "; $new_str = str_trim($orig_str); # Output: "string with spaces" print $new_str; str_trim_left($str) - removes leading whitespaces This function is similar to "str_trim()" except of it removes only leading space characters and leave trailing ones. str_trim_right($str) - removes trailing whitespaces This function is similar to "str_trim()" except of it removes only trailing space characters and leave leading ones. str_clean($str) - clean string from extra spaces Function is similar to "str_trim()" but also changes all spacing chains inside string to single spaces. str_camelize($strin) If pass undef - return undef. If pass '' - return ''. Examples: # returns 'getValue' str_camelize( 'get_value' ) # returns 'addUserAction' str_camelize( 'ADD_User_actION' ) str_decamelize(...) If pass undef - return undef. If pass '' - return ''. Examples: # returns 'get_value' str_decamelize( 'getValue' ) EXAMPLES
None yet BUGS
Unknown yet TODO
Implement examples and tests. SEE ALSO
Encode, perlunicode AUTHORS
Valentyn Solomko <pere@pere.org.ua> Michael Bochkaryov <misha@rattler.kiev.ua> perl v5.12.4 2011-08-27 NetSDS::Util::String(3pm)
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