Bash Expressions: Difference between revisions
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* [[bash#Subjects|bash]] | * [[bash#Subjects|bash]] | ||
=Difference between <tt>-a</tt> and <tt>&&</tt>= | =Conditional Expressions= | ||
==Difference between <tt>-a</tt> and <tt>&&</tt>== | |||
If want to combine the results of multiple command executions in an <tt>if</tt> condition, use <tt>&&</tt>, not <tt>-a</tt>. | If want to combine the results of multiple command executions in an <tt>if</tt> condition, use <tt>&&</tt>, not <tt>-a</tt>. | ||
Revision as of 23:30, 4 September 2016
Internal
Conditional Expressions
Difference between -a and &&
If want to combine the results of multiple command executions in an if condition, use &&, not -a.
Example:
if grep "something" /file1.txt && grep "something" /file2.txt' then
# "something" exists in both files ...
fi
-a should be used in test expressions:
if [ -f /file.txt -a -x /file.txt ]; then ... fi