Linux shell programming - special shell variables.Linux shell programming - variables and functions (readonly, unset, and functions).Linux - 7 File types : Regular, Directory, Block file, Character device file, Pipe file, Symbolic link file, and Socket file.Linux - sed III (selective printing of certain lines, selective definition of certain lines).Linux - sed II (file spacing, numbering, text conversion and substitution).Linux - sed I (substitution: sed 's///', sed -i). Linux Tips 2 - ctrl a, curl r, tail -f, umask.
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