I've finally gotten 'cpio' into a shape where it could be useable. This version can archive and extract directories, sockets, FIFOs, devices, symlinks, and regular files. Supported options are -iot, -H FMT (which is a dummy right now). It only writes newc, and could read newc or newcrc. This does NOT implement -d, which essentially is equivalent to mkdir -p $(dirname $FILE) for every file that needs it. Hard links are not supported, though it would be easy to add them given a hash table or something like that. I also have not implemented the "<n> blocks" output on stderr. If desired, I can add it pretty simply. There is one assumption this makes: that the mode of a file, as mode_t, is bitwise equivalent to the mode as defined for the cpio format. This is true of Linux, but is not mandated by POSIX. If it is compiled for a system where that is false, the archives will not be portable.

#!/bin/bash

[ -f testing.sh ] && . testing.sh

#testing "name" "command" "result" "infile" "stdin"

# Removal of extra /'s
testing "basename /-only" "basename ///////" "/\n" "" ""
testing "basename trailing /" "basename a//////" "a\n" "" ""
testing "basename combined" "basename /////a///b///c///d/////" "d\n" "" ""

# Standard suffix behavior.
testing "basename suffix" "basename a/b/c/d.suffix .suffix" "d\n" "" ""

# A suffix cannot be the entire result.
testing "basename suffix=result" "basename .txt .txt" ".txt\n" "" ""

# Deal with suffix appearing in the filename
testing "basename reappearing suffix 1" "basename a.txt.txt .txt" "a.txt\n" "" ""
testing "basename reappearing suffix 2" "basename a.txt.old .txt" "a.txt.old\n" "" ""

# A suffix should be a real suffix, only a the end.
testing "basename invalid suffix" "basename isthisasuffix? suffix" "isthisasuffix?\n" "" ""