profile.d: Avoid some warnings from shells in "nounset" mode (Debian: #776160)
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# Check for interactive bash and that we haven't already been sourced.
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if [ -n "$BASH_VERSION" -a -n "$PS1" -a -z "$BASH_COMPLETION_COMPAT_DIR" ]; then
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if [ -n "${BASH_VERSION-}" -a -n "${PS1-}" -a -z "${BASH_COMPLETION_COMPAT_DIR-}" ]; then
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# Check for recent enough version of bash.
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if [ ${BASH_VERSINFO[0]} -gt 4 ] || \
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