Question

我 st。

#!/bin/ksh

AWKSCRIPT= END { print "all done"; } 

OUTPUT=`echo hello world | awk  $AWKSCRIPT `

RETVAL=$?

echo "running echo hello world | awk  $AWKSCRIPT "
echo "Output = $OUTPUT"
echo "returned = $RETVAL"

产出

$ ./kshawk.ksh
Output = hello world
returned = 0

(我期待看到“Output = 一切已完成”)

它认为,口译人员在评估表述时并不取代AWKSCRIPT变量(如果我使用(......)美元而不是背书,我会采取同样的行为)。

虽然我可以把AWKSCRIPT放在临时档案中,但这也必须硬化吗?

Any ideas how to interpolate a variable within backticks?

Answer 1

The single quotes around $AWKSCRIPT prevent the interpolation of the variable. Double quotes do allow interpolation:

$ OUTPUT=`echo hello world | awk "$AWKSCRIPT"`
$ echo $OUTPUT
all done

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