为 Mac OS X 转换 Linux shell 脚本

Question

我们如何转换下面的 shell 脚本，以便在 Mac OS X 上实现相同的结果？

# 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

我可以算出等效的base64 命令是：

base64 --break=0 id_rsa_deploy > id_rsa_deploy_base64

但看起来split command on Mac OS X 与Linux/Unix 有点不同，并且没有--filter 选项。

编辑：这是 a gist 我从 this blog entry 偶然发现的，它详细介绍了如何使用 Travis CI 将 Octopress 博客自动部署到 GitHub。

我过去曾在 Ubuntu Linux 和 had blogged about it 上成功完成此操作，但无法在 Mac 上重复此操作。

Answer 1

您可能希望从brew（OS X 缺少的包管理器）安装 core-utils，然后使用 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