Converting DOS Batch Files to Shell Scripts: Advanced Bash-Scripting Guide:

Appendix N. Converting DOS Batch Files to Shell Scripts Quite a number of programmers learned scripting on a PC running DOS. Even the crippled DOS batch file language allowed writing some fairly powerful scripts and applications, though they often required extensive kludges and workarounds. Occasionally, the need still arises to convert an old DOS batch file to a UNIX shell script. This is general

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Linux Shellの書き方

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DOS BATファイルをBashに変換するときの変換対応早見表