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Find supports -o

find \! '(' -name '*.txt' -o -name '*.pdf' ')' 

You need the parenthesis to make the precedence right. Find does a lot of stuff; I suggest reading through its manpage.

You can also do an or in grep (but really, you should not parse the output of ls)

ls | egrep -v '\.(txt|pdf)$' | column 

Find supports -o

find . ! '(' -name '*.txt' -o -name '*.pdf' ')' 

You need the parenthesis to make the precedence right. Find does a lot of stuff; I suggest reading through its manpage.

You can also do an or in grep (but really, you should not parse the output of ls)

ls | grep -Ev '\.(txt|pdf)$' | column 

Find supports -o

find \! '(' -name '*.txt' -o -name '*.pdf' ')' 

You need the parenthesis to make the precedence right. Find does a lot of stuff; I suggest reading through its manpage.

You can also do an or in grep (but really, you shouldn't parse the output of ls)

ls | egrep -v '\.(txt|pdf)$' | column 

Find supports -o

find \! '(' -name '*.txt' -o -name '*.pdf' ')' 

You need the parenthesis to make the precedence right. Find does a lot of stuff; I suggest reading through its manpage.

You can also do an or in grep (but really, you should not parse the output of ls)

ls | egrep -v '\.(txt|pdf)$' | column 

Find supports -or

find -not '(' -name '*.txt' -or -name '*.pdf' ')' 

You need the parenthesis to make the precedence right. Find does a lot of stuff; I suggest reading through its manpage.

You can also do an or in grep (but really, you shouldn't parse the output of ls)

ls | egrep -v '\.(txt|pdf)$' | column 

Find supports -o

find \! '(' -name '*.txt' -o -name '*.pdf' ')' 

You need the parenthesis to make the precedence right. Find does a lot of stuff; I suggest reading through its manpage.

You can also do an or in grep (but really, you shouldn't parse the output of ls)

ls | egrep -v '\.(txt|pdf)$' | column