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#!/bin/sh

#

# ipcclean.sh

#

CMDNAME=`basename $0`

if [ “$1” = ‘–o “$1” = “–help” ]; then

echo “$CMDNAME cleans up shared memory and semaphores from aborted PostgreSQL”

echo “backends.”

echo

echo “Usage:”

echo ”  $CMDNAME”

echo

echo “Note: Since the utilities underlying this scrīpt are very different”

echo “from platform. to platform, chances are that it might not work on”

echo “yours. If that is the case, please write to “

echo “so that your platform. can be supported in the future.”

exit 0

fi

if [ “$USER” = ‘root’ -o “$LOGNAME” = ‘root’ ]

then

(

echo “$CMDNAME: cannot be run as root” 1>&2

echo “Please log in (using, e.g., “su””) as the (unprivileged) user that”” 1>&2

echo “”owned the server process.”” 1>&2

) 1>&2

exit 1

fi

EffectiveUser=`id -n -u 2>/dev/null || whoami 2>/dev/null`

#———————————–

# List of platform-specific hacks

# Feel free to add yours here.

#———————————–

#

# This is QNX 4.25

#

if [ `uname` = ‘QNX’ ]; then

if ps -eA  | grep -s ‘[p]ostmaster’ >/dev/null 2>&1 ; then

echo “”$CMDNAME: a postmaster is still running”” 1>&2

exit 1

fi

rm -f /dev/shmem/PgS*

exit $/p>

fi

#

# This is based on RedHat 5.2.  这里之后是该脚本的核心。

#

if [ `uname` = ‘Linux’ ]; then

did_anything=

if ps x | grep -s ‘[p]ostmaster’ >/dev/null 2>&1 ; then

echo “”$CMDNAME: a postmaster is still running”” 1>&2

exit 1

fi

# shared memory

for val in `ipcs -m -p | grep ‘^[0-9]’ | awk ‘{printf “”%s:%s:%sn””

来源：$3