Multiple expression if statement in Bash -

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i recreate this

if ( arg1 || arg2 || arg 3) {}

and did got far, following error

line 11: [.: command not found  if [ $char == $';' -o $char == $'\\' -o $char == $'\'' ] ...

i tried different ways none seem work some of ones tried

for bash, can use [[ ]] form rather [ ], allows && , || internally:

if [[ foo || bar || baz ]] ;   ... fi

otherwise, can use usual boolean logic operators externally:

[ foo ] || [ bar ] || [ baz ]

...or use operators specific test command (though modern versions of posix specification describe xsi extension deprecated -- see application usage section):

[ foo -o bar -o baz ]

...which differently written form of following, deprecated:

test foo -o bar -o baz

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