Red Hat NETSCAPE MANAGEMENT SYSTEM 6.0 - COMMAND-LINE Manual do Utilizador descarregar pdf (Página 37)

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-r filename Returns True if file, filename can be read by the

process.

-s filename Returns True if file, filename has a nonzero

length.

-w filename Returns True if file, filename can be written by

the process.

-x filename Returns True if file, filename is executable.

Expression Comparisons

!expression Returns true if expression is not true

expr1 -a expr2 Returns True if expr1 and expr2 are true.

( && , and )

expr1 -o expr2 Returns True if expr1 or expr2 is true. ( ||,

or )

If Statements

If...then

if [ expression ]

then

commands

fi

If..then...else

if [ expression ]

then

commands

else

commands

fi

If..then...else If...else

if [ expression ]

then

commands

elif [ expression2 ]

then

commands

else

commands

fi

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