sed over writes my original file (using sed to remove leading spaces) Post: 302263399

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Trying to remove leading spaces

OS : RHEL 6.7 Shell : bash I am trying to remove the leading the spaces in the below file $ cat pattern2.txt hello1 hello2 hello3 hello4 Expected output is shown below. $ cat pattern2.txt hello1 hello2 hello3 hello4

LEARN ABOUT OPENSOLARIS

concat

concat(1T)						       Tcl Built-In Commands							concat(1T)

__________________________________________________________________________________________________________________________________________________

NAME

       concat - Join lists together

SYNOPSIS

       concat ?arg arg ...?
_________________________________________________________________

DESCRIPTION

       This  command  joins  each of its arguments together with spaces after trimming leading and trailing white-space from each of them.  If all
       the arguments are lists, this has the same effect as concatenating them into a single list.  It permits any number of arguments; if no args
       are supplied, the result is an empty string.

EXAMPLES

       Although concat will concatenate lists (so the command:
	      concat a b {c d e} {f {g h}}
       will return "a b c d e f {g h}" as its result), it will also concatenate things that are not lists, and hence the command:
	      concat " a b {c	" d "  e} f"
       will return "a b {c d e} f" as its result.

       Note that the concatenation does not remove spaces from the middle of its arguments, so the command:
	      concat "a   b   c" { d e f }
       will return "a	b   c d e f" (i.e. with three spaces between the a, the b and the c).

SEE ALSO

       append(1T), eval(1T)

KEYWORDS

       concatenate, join, lists

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+-----------------+
       |  ATTRIBUTE TYPE    | ATTRIBUTE VALUE |
       +--------------------+-----------------+
       |Availability	    | SUNWTcl	      |
       +--------------------+-----------------+
       |Interface Stability | Uncommitted     |
       +--------------------+-----------------+
NOTES

       Source for Tcl is available on http://opensolaris.org.

Tcl									8.3								concat(1T)

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

how to remove spaces in a string using sed.

Discussion started by: radhika

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Remove leading zeroes in 2nd field using sed

Discussion started by: pchang

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tr and sed remove spaces. how to stop this?

Discussion started by: Trichopterus

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sed remove newlines and spaces

Discussion started by: rishav