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Top Forums UNIX for Advanced & Expert Users Delete blank spaces and blank lines in a file Post 302934792 by Don Cragun on Tuesday 10th of February 2015 08:56:58 PM
Old 02-10-2015
Quote:
Originally Posted by systemoper
Hi Gurus,
Somebody can say me how to delete blank spaces and blank lines in a file unix, please.

Thank you for advanced.
We do not seem to be getting anywhere with this thread. And, it is obvious that we have a language barrier.

We do not understand what you are trying to do. The term "blank spaces" is confusing. The standards define <space> characters, <blank> characters (which includes <space> and <horizontal-tab> characters), <blank lines> (which are lines that contain zero or more <blank>s and a line terminating <newline> character), and <empty lines> (which are lines that just contain the line terminating <newline> character).

In post #6 in this thread you said "I need to back-spaces removed". But, <backspace> characters are not <blanks> and <backspace> characters do not appear on <blank lines>.

What are you trying to do?
  1. Do you want to remove every <space> character from a file?
  2. Do you want to remove every <horizontal-tab> character from a file?
  3. After removing every <space> and <horizontal-tab> character, do you want to remove every empty line from a file?
  4. Do you want to remove every <backspace> character from a file?
  5. Are there other characters you want to remove from a file?
How do you want to do it?
  1. Do you want to print a file to paper and cut these characters out with scissors?
  2. Do you want to make these changes using an interactive editor (such as vi)?
  3. Do you want to make these changes using a non-interactive editor (such as sed)?
  4. Do you want to make these changes using a tool in a pipeline (such as tr)?
Please give us some details about what you are trying to do so we can help you!
 

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CUT(1)								   User Commands							    CUT(1)

NAME
cut - remove sections from each line of files SYNOPSIS
cut OPTION... [FILE]... DESCRIPTION
Print selected parts of lines from each FILE to standard output. With no FILE, or when FILE is -, read standard input. Mandatory arguments to long options are mandatory for short options too. -b, --bytes=LIST select only these bytes -c, --characters=LIST select only these characters -d, --delimiter=DELIM use DELIM instead of TAB for field delimiter -f, --fields=LIST select only these fields; also print any line that contains no delimiter character, unless the -s option is specified -n (ignored) --complement complement the set of selected bytes, characters or fields -s, --only-delimited do not print lines not containing delimiters --output-delimiter=STRING use STRING as the output delimiter the default is to use the input delimiter -z, --zero-terminated line delimiter is NUL, not newline --help display this help and exit --version output version information and exit Use one, and only one of -b, -c or -f. Each LIST is made up of one range, or many ranges separated by commas. Selected input is written in the same order that it is read, and is written exactly once. Each range is one of: N N'th byte, character or field, counted from 1 N- from N'th byte, character or field, to end of line N-M from N'th to M'th (included) byte, character or field -M from first to M'th (included) byte, character or field AUTHOR
Written by David M. Ihnat, David MacKenzie, and Jim Meyering. REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report cut translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
Full documentation at: <http://www.gnu.org/software/coreutils/cut> or available locally via: info '(coreutils) cut invocation' GNU coreutils 8.28 January 2018 CUT(1)
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