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Top Forums Shell Programming and Scripting How to replace all but the first 3 characters with sed? Post 302934661 by wisecracker on Monday 9th of February 2015 05:08:54 PM
Old 02-09-2015
Longhand using OSX 10.7.5, default bash terminal...
Hard coded as '3' for this DEMO.
Code:
Last login: Mon Feb  9 22:00:29 on ttys000
AMIGA:barrywalker~> echo 'kajhd(*&&#$%^ASDFGHJ{}][!\\|\00
> 123131,.,xv.,c.,.?><lksdlfk
> abcd
> def
> a' > /tmp/txt
AMIGA:barrywalker~> while read -r line; do pad="${line:3}"; echo $line; echo -E "${line:0:3}${pad//[' '-~]/*}"; done < /tmp/txt
kajhd(*&&#$%^ASDFGHJ{}][!\\|\00
kaj****************************
123131,.,xv.,c.,.?><lksdlfk
123************************
abcd
abc*
def
def
a
a
AMIGA:barrywalker~> _

EDIT:
Post the correct copy and paste... ;o)

Last edited by wisecracker; 02-09-2015 at 06:21 PM.. Reason: See above.
 

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line(1) 						      General Commands Manual							   line(1)

NAME
line - Reads one line from standard input SYNOPSIS
line STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: line: XCU5.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. OPTIONS
None DESCRIPTION
The line command copies one line, up to and including a newline, from standard input and writes it to standard output. Use this command within a shell command file to read from your terminal. The line command always writes at least a newline character. NOTES
The line utility has no internationalization features and is marked LEGACY in XCU Issue 5. Use the read utility instead. EXIT STATUS
Success. End-of-File. EXAMPLES
To read a line from the keyboard and append it to a file, enter: echo 'Enter comments for the log:' echo ': c' line >>log This shell procedure displays the message: Enter comments for the log: It then reads a line of text from the keyboard and adds it to the end of the file log. The echo ': c' command displays a : (colon) prompt. See the echo command for information about the c escape sequence. SEE ALSO
Commands: echo(1), ksh(1), read(1), Bourne shell sh(1b), POSIX shell sh(1p) Functions: read(2) Standards: standards(5) line(1)
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