链接：https://rubygems.org/gems/itools
3.2 安装 gem install itools 3.3 使用 NAME itools - a collection of tools for ios developer SYNOPSIS itools [global options] command [command options] [arguments...] VERSION 0.4.7 GLOBAL OPTIONS --help - Show this message --version - Display the program version COMMANDS count_code_line - count lines of code find - search unuse image help - Shows a list of commands or help for one command parse - Analyze the memory footprint of each part or component in Xcode project pre_commit - 通过执行该命令，hook 本地commit，然后进行规范化 search - search str(or strs) in some file(or folder's file) search_file - search File in folder search_unuse_class - search unuse class size_for - calculate the memory footprint of file or folder(contain file)更多参见：https://github.com/ScottZg/itools
4 推荐 4.1 网站1.gems：https://rubygems.org/
2.官方文档：https://docs.ruby-lang.org/en/
4.2 书籍1.《Ruby程序员修炼之道》
5 附 5.1 预定义全局变量表 Pre-defined variables $! The exception information message set by 'raise'. $@ Array of backtrace of the last exception thrown. $& The string matched by the last successful match. $` The string to the left of the last successful match. $' The string to the right of the last successful match. $+ The highest group matched by the last successful match. $1 The Nth group of the last successful match. May be > 1. $~ The information about the last match in the current scopke. $= The flag for case insensitive, nil by default. $/ The input record separator, newline by default. $\ The output record separator for the print and IO#write. Default is nil. $, The output field separator for the print and Array#join. $; The default separator for String#split. $. The current input line number of the last file that was read. $< The virtual concatenation file of the files given on command line (or from $stdin if no files were given). $> The default output for print, printf. $stdout by default. $_ The last input line of string by gets or readline. $0 Contains the name of the script being executed. May be assignable. $* Command line arguments given for the script sans args. $$ The process number of the Ruby running this script. $? The status of the last executed child process. $: Load path for scripts and binary modules by load or require. $" The array contains the module names loaded by require. $DEBUG The status of the -d switch. $FILENAME Current input file from $<. Same as $<.filename. $LOAD_PATH The alias to the $:. $stderr The current standard error output. $stdin The current standard input. $stdout The current standard output. $VERBOSE The verbose flag, which is set by the -v switch. $-0 The alias to $/. $-a True if option -a is set. Read-only variable. $-d The alias to $DEBUG. $-F The alias to $;. $-i In in-place-edit mode, this variable holds the extension, otherwise nil. $-I The alias to $:. $-l True if option -l is set. Read-only variable. $-p True if option -p is set. Read-only variable. $-v The alias to $VERBOSE. $ -w True if option -w is set. 5.2 解释器的命令行开关 Usage: ruby [switches] [--] [programfile] [arguments] -0[octal] specify record separator (\0, if no argument) -a autosplit mode with -n or -p (splits $_ into $F) -c check syntax only -Cdirectory cd to directory before executing your script -d set debugging flags (set $DEBUG to true) -e 'command' one line of script. Several -e's allowed. Omit [programfile] -Eex[:in] specify the default external and internal character encodings -Fpattern split() pattern for autosplit (-a) -i[extension] edit ARGV files in place (make backup if extension supplied) -Idirectory specify $LOAD_PATH directory (may be used more than once) -l enable line ending processing -n assume 'while gets(); ... end' loop around your script -p assume loop like -n but print line also like sed -rlibrary require the library before executing your script -s enable some switch parsing for switches after script name -S look for the script using PATH environment variable -T[level=1] turn on tainting checks -v print version number, then turn on verbose mode -w turn warnings on for your script -W[level=2] set warning level; 0=silence, 1=medium, 2=verbose -x[directory] strip off text before #!ruby line and perhaps cd to directory -h show this message, --help for more info