# Linux singer 6.18.44-0-lts x86_64
# /dev/shm and /tmp are tmpfs
# as user, nsm here:
#   touch /dev/shm/mempool.dat.new
# as root:
#   cd /home/nsm/.bitcoin
#   mount -o rw,bind /dev/shm/mempool.dat.new mempool.dat.new
# everything else here that follows
# is run as an unprivileged user
+ date -u
Tue Oct 13 13:29:06 UTC 2026
+ bitcoind -version
+ head -1
Bitcoin Core daemon version v32.0.0rc3 bitcoind
+ bitcoin-cli echo hello+ 
grep .
[
  "hello"
]
+ mountpoint /home/nsm/.bitcoin/mempool.dat.new
/home/nsm/.bitcoin/mempool.dat.new is a mountpoint
+ nicecat.sh /tmp/gmi-main.json
+ bitcoin-cli getmempoolinfo
{
  "loaded": true,
  "size": 81665,
  "bytes": 39935901,
  "usage": 222160408,
  "total_fee": 0.07456094,
  "maxmempool": 300000000,
  "mempoolminfee": 0.00000100,
  "minrelaytxfee": 0.00000100,
  "incrementalrelayfee": 0.00000100,
  "unbroadcastcount": 0,
  "permitbaremultisig": true,
  "maxdatacarriersize": 100000,
  "limitclustercount": 64,
  "limitclustersize": 101000,
  "optimal": true
}
+ : following is getrawmempool, just shortened
+ safecat.sh /dev/shm/mymempool.txt
+ grm.sh
+ : Following non-zero exit is intended.
+ : On bitcoind side it looks like this:
+ : Failed to dump mempool: Rename failed. Continuing anyway.
+ time bitcoin-cli savemempool
error code: -1
error message:
Unable to dump mempool to disk
Command exited with non-zero status 1
real	0m 0.80s
user	0m 0.00s
sys	0m 0.00s
+ f=/dev/shm/mempool.dat.new
+ : Leverage safecat to make a clean, atomic copy of the mempool dump
+ cat /dev/shm/mempool.dat.new
+ safecat.sh /dev/shm/mempool.copy
+ : Safe symlink update without crashing or throwing an error 'if' it exists
+ test '!' -e /dev/shm/mempool.copy.dat
+ cd /dev/shm
+ ls -ilh mempool.copy mempool.dat.new
2178993 -rw------- 1 nsm nsm 114M Oct 13 13:29 mempool.copy
     15 -rw-r--r-- 1 nsm nsm 114M Oct 13 13:29 mempool.dat.new
+ cd /home/nsm/web/ln
+ ls -l mymempool-log.txt mymempool.dat mymempool.txt mymempoolgen.sh.txt mymempoolhere.sh.txt
lrwxrwxrwx 1 nsm nsm   22 Feb 21  2025 mymempool-log.txt -> /dev/shm/mymempool.log
lrwxrwxrwx 1 nsm nsm   21 Dec 10  2024 mymempool.dat -> /dev/shm/mempool.copy
lrwxrwxrwx 1 nsm nsm   22 Feb 18  2025 mymempool.txt -> /dev/shm/mymempool.txt
-rw-r--r-- 1 nsm nsm 1477 Oct 11 17:24 mymempoolgen.sh.txt
-rwx------ 1 nsm nsm 1461 Apr 19 12:01 mymempoolhere.sh.txt
+ date -u
Tue Oct 13 13:29:09 UTC 2026