[SOLVED] troubles with bash script tests "-z" and "-n"
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Since the solution involved quoting within scripts, I offer the following from the man bash manual page:
Enclosing characters in single quotes preserves the literal value of each character within the quotes. A single quote may not occur between single quotes, even when preceded by a backslash.
Enclosing characters in double quotes preserves the literal value of
all characters within the quotes, with the exception of $, `, \,
and, when history expansion is enabled, !. The characters $ and `
retain their special meaning within double quotes. The backslash
retains its special meaning only when followed by one of the
following characters: $, `, ", \, or <newline>. A double quote may
be quoted within double quotes by preceding it with a backslash.
If enabled, history expansion will be performed unless an ! appearing in double quotes is escaped using a backslash.
The backslash preceding the ! is not removed.