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Bourne Shell script path detection
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| ME="$0" | |
| REAL_ME="$ME" | |
| while [ -h "$REAL_ME" ]; do | |
| LINK_TARGET="$(readlink "$REAL_ME")" | |
| case "$LINK_TARGET" in | |
| /*) ;; | |
| *) LINK_TARGET="$(dirname "$REAL_ME")/$LINK_TARGET" | |
| esac | |
| REAL_ME="$LINK_TARGET" | |
| done | |
| BINDIR="$(dirname "$REAL_ME")" | |
| case "$BINDIR" in | |
| /*) ;; | |
| *) | |
| cd "$BINDIR" | |
| BINDIR="$PWD" | |
| cd - >/dev/null | |
| ;; | |
| esac |
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Detects the parent directory of the executed shell script. Handles invocations through absolute (/bin/foo) and relative (../qux/foo) path specifications, invocations from $PATH (foo). Also resolves intermediate symlinks (absolute and relative).