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Operating Systems Linux Red Hat Echo and grep issues
# 1  
Old 04-29-2015
Echo and grep issues
Is there an environment issue that would not allow the following not store and pass the value into this field:
Code:
underScorePresent=`echo $USER | grep "_" | wc -l`

It is running on a new redhat 6.5 OS. The value $USER is set to cpac. It is a vendor code and they are saying it is environment issue and not a code/script issue. Any thougths?
Last edited by Franklin52; 04-30-2015 at 10:30 AM.. Reason: Please use code tags
# 2  
Old 04-29-2015
They mean that $USER is set by some shells only.
I have always used "${USER:-$LOGNAME}" therefore - display LOGNAME if USER is not set.
BTW you can simplify the shell code to
Code:
underScorePresent=`echo "${USER:-$LOGNAME}" | grep -c "_"`

(as well returns 0 or 1).
Or to this one
Code:
[[ "${USER:-$LOGNAME}" != *_* ]]; underScorePresent=$?

Or even to this one (returns 0 or a positive number)
Code:
underScorePresent=`expr x"${USER:-$LOGNAME}" : x".*_"`

Last edited by MadeInGermany; 04-29-2015 at 12:37 PM..
This User Gave Thanks to MadeInGermany For This Post:
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