Command reference

The complete built-in command set, plus the grammar the REPL understands.

borescope ships a deliberately small command set. Pebble's own vocabulary is first-class, the familiar file commands are implemented over Pebble's files API, and exec runs anything else that's already in the container. Run help at the prompt for a live list.

Line grammar

The REPL parser is intentionally tiny: one command at a time, with at most a single | pipe between two stages. Variables ($VAR, ${VAR}) expand from the session's tracked environment.

These shell features are not supported, and borescope reports a clear error rather than doing something surprising:

• sequencing (;)
• background jobs (&)
• && and ||
• redirection (>, >>, <)
• subshells (( … ))

That covers the overwhelming majority of debug-shell use; for anything that needs a real shell, exec a binary in the container.

Shell built-ins

State and session commands.

File commands

These are built in, rather than left to exec, because they need either session state (paths relative to the current directory) or Pebble's files API, so they work against a rock with no shell and no coreutils.

pull and push cross the host/container boundary; the rest operate inside the container. See Copy files in and out.

Process commands

A rock usually has no ps binary, so exec ps fails on exactly the images borescope is for. Everything ps reports lives in /proc, though, and Pebble's files API can read it — so ps is built in, like the file commands.

The option surface follows POSIX ps: -e selects every process, -f and -l are the full and long listings, and -o takes the POSIX field names (pid, ppid, pgid, user, ruser, group, rgroup, pcpu, vsz, nice, etime, time, tty, comm, args) with optional field=HEADER renaming. BSD-style ps aux is not supported; use ps -ef.

pebble:/# ps -ef
UID    PID  PPID  C STIME TTY     TIME CMD
root     1     0  0 09:14 ?   00:00:04 /usr/bin/pebble run --create-dirs
app     14     1  0 09:14 ?   00:12:02 myapp --config /etc/myapp/config.yaml

One deliberate divergence from POSIX: with no selection options, ps lists every process, as if -e were given. POSIX's default selects processes matching the invoker's effective user ID and controlling terminal, but borescope is not a process inside the container, so there is nothing to match.

Pebble-native commands

Pebble's operational vocabulary, exposed directly, no pebble prefix.

start, stop, restart, and replan change the running container. logs --follow and tail -f stream until you press Ctrl-C and can't be used inside a pipe.

Tabular output

The list commands above (services, checks, notices, changes, tasks) follow the same convention:

• Headers are UPPER CASE and bold; columns are separated by two spaces. Pass --no-headers to suppress the header line (handy for piping into awk, cut, or sort).
• When the listing is empty, a short note goes to stderr (No services configured., No checks configured., …) and the exit code stays 0. Stdout is empty, so borescope myapp/0 --command services | wc -l reports 0 when there are no services.
• --format=json and --format=yaml emit a machine-readable form instead of the table. Empty lists render as [] (JSON) or items: [] (YAML), again with exit code 0 and no stderr noise.

exec

exec <command> [args…]

The escape hatch. exec runs a program that is already present in the container, in your current session directory, and reports its stdout, stderr, and exit code:

pebble:/# exec id
pebble:/# exec myapp-ctl reload
pebble:/# exec /usr/bin/myapp --version

If the binary isn't in the rock, exec reports that it couldn't run it, which is expected on a minimal image. borescope doesn't bundle tools into the container; exec only reaches what's there. See Scope and philosophy.

Getting help in-session

help (or ?) lists every built-in command with its one-line summary, and reminds you that anything else can be run with exec:

pebble:/# help
Built-in commands (anything else: 'exec <cmd> ...' runs it in the container):
  cat       Concatenate and print files
  cd        Change the current directory
  …