The ed utility is the standard text editor.
IPCALC(1) General Commands Manual IPCALC(1)
ipcalc - perform simple manipulation of IP addresses
ipcalc [OPTION]... [/prefix] [netmask]
ipcalc provides a simple way to calculate IP information for a host. The various options specify what information ipcalc should display on standard out. Multiple options may be specified. An IP address to operate on must always be specified. Most operations also require a netmask or a CIDR prefix as well.
pwnguin: “23: "what does "grep '^asdf$;'" match?"
Beginning of line, followed by the left hand homerow, followed by the end of line? Is there a file or something that you think this is present in?”
23: “Nope, that's not it. It's not a question about i/o or something, just about how the regex works in this case.”
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