Convert Linux shell script for Mac OS X

Question

How do we convert the below shell script so that the same result can be achieved on Mac OS X?

# To generate secure SSH deploy key for a github repo to be used from Travis
# https://gist.github.com/floydpink/4631240
base64 --wrap=0 ~/.ssh/id_rsa_deploy > ~/.ssh/id_rsa_deploy_base64
ENCRYPTION_FILTER="echo \$(echo \"- secure: \")\$(travis encrypt \"\$FILE='\`cat $FILE\`'\" -r floydpink/harimenon.com)"
split --bytes=100 --numeric-suffixes --suffix-length=2 --filter="$ENCRYPTION_FILTER" ~/.ssh/id_rsa_deploy_base64 id_rsa_

# To reconstitute the private SSH key once running inside Travis (typically from 'before_script')
echo -n $id_rsa_{00..30} >> ~/.ssh/id_rsa_base64
base64 --decode --ignore-garbage ~/.ssh/id_rsa_base64 > ~/.ssh/id_rsa
chmod 600 ~/.ssh/id_rsa
echo -e "Host github.com\n\tStrictHostKeyChecking no\n" >> ~/.ssh/config

I could figure out the equivalent base64 command to be:

base64 --break=0 id_rsa_deploy > id_rsa_deploy_base64

But it looks like the split command on Mac OS X is a little different from Linux/Unix and does not have the --filter option.

EDIT: This is a gist I stumbled on to from this blog entry that details how to auto-deploy an Octopress blog to GitHub using Travis CI .

I had successfully done this from Ubuntu Linux and had blogged about it as well in the past, but could not repeat it from a Mac.

Answer 1

You may want to install core-utils from brew (The missing package manager for OS X) and then use gsplit :

$ brew install coreutils
$ gsplit --help
Usage: gsplit [OPTION]... [INPUT [PREFIX]]
Output fixed-size pieces of INPUT to PREFIXaa, PREFIXab, ...; default
size is 1000 lines, and default PREFIX is 'x'.  With no INPUT, or when INPUT
is -, read standard input.

Mandatory arguments to long options are mandatory for short options too.
  -a, --suffix-length=N   generate suffixes of length N (default 2)
      --additional-suffix=SUFFIX  append an additional SUFFIX to file names.
  -b, --bytes=SIZE        put SIZE bytes per output file
  -C, --line-bytes=SIZE   put at most SIZE bytes of lines per output file
  -d, --numeric-suffixes[=FROM]  use numeric suffixes instead of alphabetic.
                                   FROM changes the start value (default 0).
  -e, --elide-empty-files  do not generate empty output files with '-n'
      --filter=COMMAND    write to shell COMMAND; file name is $FILE
  -l, --lines=NUMBER      put NUMBER lines per output file
  -n, --number=CHUNKS     generate CHUNKS output files.  See below
  -u, --unbuffered        immediately copy input to output with '-n r/...'
      --verbose           print a diagnostic just before each
                            output file is opened
      --help     display this help and exit
      --version  output version information and exit