Shulou(Shulou.com)06/02 Report--

It is best to quote variables in double quotes, for example:

A = "a b c"

If [$a = "a b c"]; then

Echo "yes"

Fi

Run this script and you will get an error.

Should be changed to:

A = "a b c"

If ["$a" = "a b c"]; then

Echo "yes"

Fi

At this time, because the script without double quotes will be confused by the spaces in the variables, regardless of whether there are spaces in the variables, it is a good practice to put double quotation marks when referencing the variables.

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