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Top Forums Shell Programming and Scripting sed escape character for comment string "/*" Post 302524554 by toeharp on Monday 23rd of May 2011 07:56:53 PM
Old 05-23-2011
Hey agama ~

Your point on alternate delimiters is a great one - It does make the line much easier to read.

Unfortunately, mixing the quotes didn't solve the problem - this revised code containing your changes (and simplified further with hardcoded values) still interprets asterisk as list commands:

Code:
tb=`echo "Select Date" | sed 's! !&\/\* bm=001 run=000001 \*\/ !'`; echo $tb

It seems to be related to the backquote / command substitution...
If I copy-out the variable-set part of the line, the code returns the expected results - except those results are not saved back into the variable, they're simply echo'ed to the terminal.

Thus, this sub-string of the above code returns the correct value:
Code:
echo "Select Date" | sed 's! !&\/\* bm=001 run=000001 \*\/ !'

...except the variable $tb isn't updated. Wrap the tb=`[]` around it, and it misbehaves.

I might be confused on the way command substitution works... I thought it basically ran everything within the backquotes first, then stdout the results like any completed function. This is why I'm confused why the bottom code works fine, but the top one does not. Maybe someone needs to correct my thinking...

Smilie

Thanks!
 

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echo(1) 						      General Commands Manual							   echo(1)

NAME
echo - echo (print) arguments SYNOPSIS
[arg] ... DESCRIPTION
writes its arguments separated by blanks and terminated by a new-line on the standard output. It also understands C-like escape conven- tions; beware of conflicts with the shell's use of write an alert character backspace print line without appending a new-line form-feed new-line carriage return tab vertical tab backslash the 8-bit character whose ASCII code is the 1-, 2-, 3- or 4-digit octal number n, whose first character must be a zero. write an 8-bit value that is the zero-, one-, two- or three-digit octal number num is useful for producing diagnostics in command files and for sending known data into a pipe. Notes Berkeley differs from this implementation. The former does not implement the backslash escapes. However, the semantics of the escape can be obtained by using the option. The echo command implemented as a built-in function of follows the Berkeley semantics (see csh(1)). EXTERNAL INFLUENCES
Environment Variables determines the interpretation of arg as single and/or multi-byte characters. If is not specified in the environment or is set to the empty string, the value of is used as a default for each unspecified or empty vari- able. If is not specified or is set to the empty string, a default of "C" (see lang(5)) is used instead of If any internationalization variable contains an invalid setting, behaves as if all internationalization variables are set to "C". See environ(5). International Code Set Support Single- and multi-byte character code sets are supported. AUTHOR
was developed by OSF and HP. SEE ALSO
sh(1). BUGS
No characters are printed after the first This is not normally a problem. STANDARDS CONFORMANCE
echo(1)
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