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q[uit] - Quit. Note: To quit without an ‘are you sure?’ prompt, use quit unconditionally (q!)
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kill - Really quit. This uses kill -9, for situations where quit just isn’t fierce enough
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c[ontinue] <line-number> - Carry on running until program ends, hits a breakpoint or reaches line line-number (if specified)
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n[ext] <number> - Go to next line, stepping over function calls. If number specified, go forward that number of lines
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s[tep] <number> - Go to next line, stepping into function calls. If number is specified, make that many steps
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b[ack]t[race] — a.k.a. “w[here]” - Display stack trace
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h[elp] <command-name> - Help. When passed the name of a command, gives help on using that command
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b[ack]t[race] — a.k.a. “w[here]” - Display stack trace
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f[rame] <frame-number> - Moves to <frame-number> (frame numbers are shown by bt). With no argument, shows the current frame
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up <number> - Move up <number> frames (or 1, if no number specified)
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down <number> - Move down <number> frames (or 1, if no number specified)
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info args - Arguments of the current frame
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info locals - Local variables in the current stack frame
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info instance_variables - Instance variables in the current stack frame
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info global_variables - Current global variables
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info variables - Local and instance variables of the current frame
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m[ethod] <class|module> - Shows instance methods of the given class or module
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m[ethod] i[nstance] <object> - Shows methods of <object>
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m[ethod] iv <object> - Shows instance variables of <object>
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v[ar] cl[ass] - Shows class variables of self
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v[ar] co[nst] <object> - Shows constants of <object>
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v[ar] g[lobal] - Shows global variables (same as info global_variables)
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v[ar] i[nstance] <object> - Shows instance variables of <object> (same as method iv <object>)
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v[ar] l[ocal] - Shows local variables (same as info locals)
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e[val] — a.k.a. “p” <expression> - Evaluate <expression> and display result. By default, you can also just type the expression without any command and get the same thing (disabled by using set noautoeval
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pp - Evaluate expression and pretty-print the result
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putl - Evaluate an expression with an array result and columnize the output
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ps - Evaluate an expression with an array result, sort and columnize the output
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disp[lay] <expression> - Automatically display <expression> every time the program halts. With no argument, lists the current display expressions
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info display - List all current display expressions
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undisp[lay] <number> - Remove display expression number <number> (as listed by info display). With no argument, cancel all current display expressions
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disable display <number> - Stop displaying expression number <number>. The display expression is kept in the list, though, and can be turned back on again using enable display
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enable display <number> - Re-enable previously disabled display expression <number>
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b[reak] - Sets a breakpoint at the current line. These can be conditional: break if foo != bar. Keep reading for more ways to set breakpoints!
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b[reak] <filename>:<line-number> - Puts a breakpoint at line-number in filename (or the current file if filename is blank). Again, can be conditional: b myfile.rb:15 unless my_var.nil?
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b[reak] <class>(.|#)<method> - Puts a breakpoint at the start of the method in class. Accepts an optional condition: b MyClass#my_method if my_boolean
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info breakpoints - List all breakpoints, with status
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cond[ition] <number> <expression> - Add condition expression to breakpoint number<>. If no expression is given, removes any conditions from that breakpoint
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del[ete] <number> - Deletes breakpoint <number>. With no arguments, deletes all breakpoints
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disable breakpoints <number> - Disable (but don’t delete) breakpoint <number>. With no arguments, disables all breakpoints
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cat[ch] <exception> off - Enable or (with off argument) disable catchpoint on <exception>
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cat[ch] - Lists all catchpoints
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cat[ch] off - Deletes all catchpoints
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sk[ip] - Passes a caught exception back to the application, skipping the catchpoint.
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hist[ory] <num-commands> - view last <num-commands> byebug commands (or all, if no argument given).
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save <file> - saves current byebug session options as a script file in <file>
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source <file> - loads byebug options from a script file at <file>
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set <option> - change value of byebug option <option>
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show <option> - view current value of byebug option <option>
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reload - Reload source code
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info file - Information about the current source file
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info files - All currently loaded files
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info lines - Shows the current line number and filename
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l[ist] - Shows source code after the current point. Keep reading for more list options
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l[ist] – - Shows source code before the current point
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l[ist] = - Shows source code centred around the current point
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l[ist] <first>-<last> - Shows all source code from <first> to <last> line numbers
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edit <file:lineno> - Edit <file>. With no arguments, edits the current file
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c[ontinue] <line-number> - Carry on running until program ends, hits a breakpoint or reaches line line-number (if specified)
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n[ext] <number> - Go to next line, stepping over function calls. If number specified, go forward that number of lines
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s[tep] <number> - Go to next line, stepping into function calls. If numberis specified, make that many steps
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fin[ish] <num-frames> - With no argument, run until the current frame returns. Otherwise, run until <num-frames> frames have returned
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irb - Start an IRB session
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restart - Restart the program. This also restarts byebug
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th[read]
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Show current thread
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th[read] l[ist]
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List all threads
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th[read] stop <number>
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Stop thread number <number>
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th[read] resume <number>
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Resume thread number <number>
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th[read] <number>
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Switch context to thread <number>
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Cheatography n. The art of mapping complex subjects into clear, instantly navigable reference guides.
