Get contents before a colon
This is what cut
is for:
$ cat file
help.helloworld.com:latest.world.com
dev.helloworld.com:latest.world.com
foo:baz:bar
foo
$ cut -d: -f1 file
help.helloworld.com
dev.helloworld.com
foo
foo
You just set the delimiter to :
with -d:
and tell it to only print the 1st field (-f1
).
Or an alternative:
$ grep -o '^[^:]*' file
help.helloworld.com
dev.helloworld.com
This returns any characters beginning at the start of each line (^
) which are no colons ([^:]*
).
Would definitely recommend awk
:
awk -F ':' '{print $1}' file
Uses :
as a field separator and prints the first field.