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Module Sys_utils

Various system utility functions.

Signature

val get_editor : unit -> string option

Get the default editor (program) for this user. This functions checks the EDITOR and VISUAL environment variables and then looks into a hard coded list of editors.

val get_editor_exn : unit -> string
val get_pager : unit -> string option

Analogous to get_editor, defaulting to a list including less and more.

val page_contents : ?pager:string -> ?pager_options:string list -> ?tmp_name:string -> string -> unit

page_contents ?pager ?tmp_name str will show str in a pager. The optional tmp_name parameter gives the temporary file prefix. The temporary file is removed after running.

val pid_alive : Core.Std.Pid.t -> bool
val get_groups : string -> string list
val with_tmp : pre:string -> suf:string -> (string -> 'a) -> 'a

with_tmp pre suf f creates a temp file, calls f with the file name, and removes the file afterwards.

val diff : ?options:string list -> string -> string -> string

diff s1 s2 returns diff (1) output of the two strings. Identical files returns the empty string. The default value of options is "-d -u", to provide shorter, unified diffs.

val ip_of_name : string -> string

ip_of_name hostname looks up the hostname and prints the IP in dotted-quad format.

val getbyname_ip : unit -> string

getbyname_ip () returns the IP of the current host by resolving the hostname.

val ifconfig_ips : unit -> Core.Std.String.Set.t

ifconfig_ips () returns IPs of all active interfaces on the host by parsing ifconfig output. Note that this will include 127.0.0.1, assuming lo is up.

val checked_edit : ?create:bool -> check:(string -> string option) -> string -> [
| `Abort
| `Ok
]

checked_edit ~check file

Edit a file in safe way, like vipw(8). Launches your default editor on file and uses check to check its content.

Param [check] a function returning a text representing the error in the file.
Param [create] create the file if it doesn't exists. Default true
Returns `Ok or `Abort. If `Abort is returned the files was not modified (or created).
module Sexp_checked_edit (S : Core.Std.Sexpable) : sig .. end
Edit files containing sexps.
module Cpu_use : sig .. end
A module for getting a process's CPU use.
module Lsb_release : sig .. end