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Top Forums Shell Programming and Scripting Syntax error piping to bc on command line - works when assigned to var Post 302588625 by methyl on Monday 9th of January 2012 01:32:22 PM
Old 01-09-2012
Explanation of the error.
Your "tr" command strips out all line terminators (\n) for some unknown reason and converts them to "+" signs. My version of "sed" will not process lines without a line terminator, but yours appears to work (to my surprise).

The "bc" program fails because the input stream is not terminated with a linefeed character (\n).

When you "echo" the variable $var1 the "echo" statement appends a linefeed character (\n).

Btw. The unix standard version of "tr" will not translate three different characters into one. The length of the translate list must be the same both sides.
Code:
echo "xyz" | tr 'xyz' '+'
+yz
echo "xyz" | tr 'xyz' '+++'
+++

In your script this would only matter if there were carriage-return or form-feed characters in the line (which there are clearly not).
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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.11 3 Aug 1994 echo(1B)
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