strange asterisk expansion in bash

Asked Jun 09 '19 at 19:49

Active Jun 09 '19 at 19:53

Viewed 32 times

Strange asterisk expansion

#!/bin/bash
my_IP=$(curl -m 5   -s  icanhazip.com)
rv=$?
szOut="--- curl error ($rv) ---"
if [ $rv -eq 0 ]; then
    szOut="*** today my IP is {$my_IP} ***"
fi
echo $szOut
exit 0

Under rv=0 I expected "* today my IP is {80.29.32.166} *

but got

get_ip.sh llegir_ip_externa.sh my_crons send_ftp.sh welcome.sag today my IP is {80.29.32.166} get_ip.sh llegir_ip_externa.sh my_crons send_ftp.sh welcome.sag

This is, the 3 asterisks expand into the list of files in this directory - 2 times, one at begin of line, other at end.

I fixed my problem changing "***" into "+++", but now I want to know the origin of this "expansion", as I use asterisks quite often.

Any pointer, URL, or PDF is welcome.

Thanks.

edited Jun 09 '19 at 19:53

Cyrus

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asked Jun 09 '19 at 19:49

Sebastia.Net

[Glob Expansion](http://www.tldp.org/LDP/abs/html/globbingref.html) : "Globbing interprets the standard wild card characters * and ?, character lists in square brackets, and certain other special characters" – Aaron Jun 09 '19 at 19:52
Paste your script there: http://www.shellcheck.net/ – Cyrus Jun 09 '19 at 19:56
The solution is "do double quote" : – Sebastia.Net Jun 11 '19 at 13:58
#!/bin/bash szOut="*** --- curl." echo "$szOut" exit 0 – Sebastia.Net Jun 11 '19 at 13:58

strange asterisk expansion in bash

0 Answers0