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Top Forums Shell Programming and Scripting Hex to decimal - Execute command for the matching part Post 302472658 by fpmurphy on Wednesday 17th of November 2010 06:45:53 PM
Old 11-17-2010
No need to call an external utility such as sed. It can all be very easily done within the shell.
Code:
while IFS="=" read hex rest
do
    printf "%d=%s\n" hex rest
done < infile

Corona is correct. sed doesn't evaluate shell statements.
Code:
 sed 's/^.\{4\}/'"`date`"'/' inputfile

It is the shell that expands the above to this expression before calling the sed utility
Code:
sed 's/^.\{4\}/'"Wed Nov 17 22:21:40 CET 2010"'/' inputfile


Last edited by fpmurphy; 11-17-2010 at 07:53 PM..
 

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fmt(1)							      General Commands Manual							    fmt(1)

NAME
fmt - format text SYNOPSIS
width] [file...] DESCRIPTION
The command is a simple text formatter that fills and joins lines to produce output lines of (up to) the number of characters specified in the width option. The default width is 72. concatenates the arguments. If none are given, formats text from the standard input. Blank lines are preserved in the output, as is the spacing between words. does not fill lines beginning with a period for compatibility with Nor does it fill lines starting with Indentation is preserved in the output and input lines with differing indentation are not joined (unless is used). can also be used as an in-line text filter for the command: reformats the text between the cursor location and the end of the paragraph. Options recognizes the following options: Crown margin mode. Preserve the indentation of the first two lines within a paragraph and align the left margin of each subsequent line with that of the second line. This is useful for tagged paragraphs. Split lines only. Do not join short lines to form longer ones. This prevents sample lines of code, and other such "formatted" text, from being unduly combined. Fill output lines to up to width columns. WARNINGS
The width option is acceptable for BSD compatibility, but it may go away in future releases. SEE ALSO
nroff(1), vi(1). fmt(1)
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