Find missing numbers in continuous filenames (advanced ls & find)


Let's say I have a script that generates incrementing folder names over time (100, 101, 102, 103, 104, etc...). These folders are synced between machines and there is a chance of creation failure for any given folder on system 2.

System 1 is always in sync: 100/ 101/ 102/ 103/ 104/ etc...

System 2 may have errors: 100/ 102/ 103/ etc...

(as you can see, 101/ & 104/ are missing on system 2)

<strong>How can I generate a list of all the missing folders on System 2?</strong>

P.S. Rsync is not really an option because the actual number of folders is incredibly high.


You can pipe the contents of ls on each machine to a file, and then diff the two files. You can also use the command comm to show lines that are only in one file, and not in the other.


You could do something like this:

% ls -1 System1 > ls.System1 # Use the -1 flag to ensure 1 dir per line % ls -1 System2 > ls.System2 % comm -23 ls.System1 ls.System2 101 104

The comm command can show you what is common to both, unique to f1, or unique to f2:

comm -12 f1 f2 # common to both comm -23 f1 f2 # unique to f1 comm -13 f1 f2 # unique to f2


just generate a list of successful creations as they occur


you can use diff. assuming you had already mapped system2 to a path

diff system1/path system2/path


  • Ways to synch many (small) files over high-latency network connection
  • git installation needed on remote server which is access via ssh only
  • Deploy subdirectory with mina
  • gulp: passing dependent task return stream as parameter
  • readyRead() signal of QextSerialPort (QIODevice) is not being called fast enough
  • Git cherry-Pick a batch of commits from a file
  • console.log printing statements in the wrong order for learnyounode node.js tutorial
  • Determining the length of a read stream in node js
  • WP7 difficulties binding data to listbox itemssource - won't refresh
  • java.lang.IndexOutOfBoundsException occuring on ArrayList
  • Ruby 1.8.6 Array#uniq not removing duplicate hashes
  • Synchronize windows folders
  • Configure Spring's MappingJacksonHttpMessageConverter
  • How to read piped content in C?
  • AppleScript : find open tab in safari by name and open it
  • SetWindowsHookEx does not react on media keys
  • How to revert to previous XCode version?
  • How do I access an unhandled exception in an MVC Error view?
  • Make VS2015 use angular-cli ng at build time in a .NET project
  • Google Custom Search with transparent background
  • Update CALayer sublayers immediately
  • How to add a column to a Pandas dataframe made of arrays of the n-preceding values of another column
  • Where to put my custom functions in Wordpress?
  • vba code to select only visible cells in specific column except heading
  • Build own AppleScript numerical error handling
  • Rearranging Cells in UITableView Bug & Saving Changes
  • Numpy divide by zero. Why?
  • Circular dependency while pushing http interceptor
  • Linker errors when using intrinsic function via function pointer
  • Why joiner is not used after Sequence generator or Update statergy
  • FormattedException instead of throw new Exception(string.Format(…)) in .NET
  • Exception on Android 4.0 `android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode)`
  • File not found error Google Drive API
  • Turn off referential integrity in Derby? is it possible?
  • Add sale price programmatically to product variations
  • Is it possible to post an object from jquery to bottle.py?
  • Unable to use reactive element in my shiny app
  • Android Heatmap on canvas or ImageView
  • To Get the radio button value in ruby on rails
  • How do I use LINQ to get all the Items that have a particular SubItem?