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05-26-2009
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variable redirect messing up a sed command.
Not sure if that title is decent, but here we go. I'm running this string of commands: Code:
qstat -f $1 | sed 's/^[ \t]*//' | sed -n -e ":a" -e "$ s/\n//gp;N;b a" | sed 's/\\,/,/' | awk -F"PBS_O_WORKDIR=" '{print $2}' | awk -F",PBS_O_SYSTEM" '{print $1}'
In case you're curious is takes the output of a PBS queue, removes all the leading spaces, removes all the linebreaks, removes the backslash escape character in front of any commas, then grabs the output between two strings, effectively extracting a variable from a large mess of output from PBS. When I run that, it works just fine, all steps work perfectly. However, when I direct the output into a variable, the sed command to remove the backslash fails. So, I simplified the problem: echo "Hello\,World" | sed 's/\\,/,/' --> "Hello,World" var=`echo "Hello\,World" | sed 's/\\,/,/'`; echo $var --> "Hello\,World" any thoughts? |
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05-26-2009
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"Cascading backslashes" a.k.a "Leaning toothpicks"!  Code:
var=`echo "Hello\,World" | sed 's/\\\,/,/'`; echo $var --> "Hello,World" seems to work! It's because the backticks are spawning another subshell, but the original backslashes have already been interpreted by the first one. |
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05-27-2009
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this simple tr will do that Code:
echo "Hello\,World"|tr -d '\\' |
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