losetup -f
losetup -f -s
losetup -f file
-testing "cat" "cat && echo yes" "oneyes\n" "" "one"
-testing "cat -" "cat - && echo yes" "oneyes\n" "" "one"
-testing "cat file1 file2" "cat file1 file2" "one\ntwo\n" "" ""
-testing "cat - file" "cat - file1" "zero\none\n" "" "zero\n"
-testing "cat file -" "cat file1 -" "one\nzero\n" "" "zero\n"
-
-testing "cat file1 notfound file2" \
- "cat file1 notfound file2 2>stderr && echo ok ; cat stderr; rm stderr" \
- "one\ntwo\ncat: notfound: No such file or directory\n" "" ""
-
-testing "cat file1" \
- "cat /proc/self/exe > file1 && cmp /proc/self/exe file1 && echo yes" \
- "yes\n" "" ""
-
-testing "cat - file1" \
- "cat - file1 | diff -a -U 0 - file1 | tail -n 1" \
- "-hello\n" "" "hello\n"
-
-testing "cat > /dev/full" \
- "cat - > /dev/full 2>stderr && echo ok; cat stderr; rm stderr" \
- "cat: xwrite: No space left on device\n" "" "zero\n"
losetup -d