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Beginner's Reference Guide for Bash.
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Database (DB) Programming Tutorials
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Cross Platform GUI Programming Tutorials
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GNU Autoconf Reference Manual
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GNU Automake Reference Manual
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GNU Bison (Yacc) Parser Generator Reference Manual
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GNU Gettext Reference Manual
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GNU Guile 2.2 Language Reference Guide
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GNU Linux CPP (C Pre-processor) Manual
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Valgrind Debugger Reference
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ffmpeg Reference Manual
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GNU Linux DiffUtils Reference Manual
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Python Tutorial (A byte of python)
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Python Developer's Handbook (Manual)
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Reference Manual for Apache Web Server
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FreeBSD Handbook
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GNU Linux FindUtils Reference Manual
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Ruby Language User's Guide
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Advanced Referene Guide for Bash
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Reference Guide for Python 3.6