On 2020-09-20 20:52, Gary Dale wrote:
On 2020-09-20 22:55, David Christensen wrote:
2020-09-20 19:50:55 dpchrist@tinkywinky ~/sandbox/sh
$ cat debian-user-20200920-1727-gary-dale.sh
#!/bin/sh
doublequote="/root/clamscan-report"
echo $doublequote
singlequote='/root/clamscan-report'
echo $singlequote
noquote='/root/clamscan-report'
echo $noquote
2020-09-20 19:53:02 dpchrist@tinkywinky ~/sandbox/sh
$ /bin/sh -x debian-user-20200920-1727-gary-dale.sh
+ doublequote=/root/clamscan-report
+ echo /root/clamscan-report
/root/clamscan-report
+ singlequote=/root/clamscan-report
+ echo /root/clamscan-report
/root/clamscan-report
+ noquote=/root/clamscan-report
+ echo /root/clamscan-report
/root/clamscan-report
In the simple case, the quotes are the same, but there are times when
they have different behaviours. I avoid single-quotes so that when I use
them, it's a clue that there is a reason.
AIUI the Bourne shell interpolates variables, and potentially other
constructs, within double-quotes. I avoid double quotes unless I want
interpolation.
Here's what I got with your script:
/root/clamscan-report
/root/clamscan-report
/root/clamscan-report
When I retried my script with the quotes, it started working. I have no
idea what changed from earlier today. I certainly didn't update anything
on either server...
I find that a version control system can be very useful for system
administration, by allowing me to check in and verify all of my
configuration files, scripts, etc..
David
