Newbie @ EMC2 : How to reroute EMC2 (HAL) ouput?

I tried today do run

loadrt sampler depth=600 cfg=bbbbbbbbb
net xstep => sampler.0.pin.0
net xdir => sampler.0.pin.1
net ystep => sampler.0.pin.2
net ydir => sampler.0.pin.3
net zstep => sampler.0.pin.4
net zdir => sampler.0.pin.5
net astep => sampler.0.pin.6
net adir => sampler.0.pin.7
net xenable => sampler.0.pin.8
addf sampler.0 servo-thread
start
loadusr halsampler XYZsempler.txt

In custom_postgui.hal and it seems that the last command is not working - that is, I dont get XYZsempler.txt file.

Is this OK or is it a bug? What is the difference between custom.hal and custom_postgui.hal?

[16430.037603] RTAI[math]: unloaded.
[16430.101772] SCHED releases registered named ALIEN RTGLBH
[16430.132559] RTAI[malloc]: unloaded.
[16430.232073] RTAI[sched]: unloaded (forced hard/soft/hard transitions: traps 0, syscalls 0).
[16430.238754] I-pipe: Domain RTAI unregistered.
[16430.238804] RTAI[hal]: unmounted.
[16451.461971] I-pipe: Domain RTAI registered.
[16451.461981] RTAI[hal]: <3.8.1> mounted over IPIPE-NOTHREADS 2.6-03.
[16451.461985] RTAI[hal]: compiled with gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5) .
[16451.462027] RTAI[hal]: mounted (IPIPE-NOTHREADS, IMMEDIATE (INTERNAL IRQs DISPATCHED), ISOL_CPUS_MASK: 0).
[16451.462031] PIPELINE layers:
[16451.462035] fda82e20 9ac15d93 RTAI 200
[16451.462038] c085cb20 0 Linux 100
[16451.489820] RTAI[malloc]: global heap size = 2097152 bytes, <BSD>.
[16451.490100] RTAI[sched]: IMMEDIATE, MP, USER/KERNEL SPACE: <with RTAI OWN KTASKs>, kstacks pool size = 524288 bytes.
[16451.490108] RTAI[sched]: hard timer type/freq = APIC/8333578(Hz); default timing: periodic; linear timed lists.
[16451.490113] RTAI[sched]: Linux timer freq = 250 (Hz), TimeBase freq = 1600037000 hz.
[16451.490116] RTAI[sched]: timer setup = 999 ns, resched latency = 2943 ns.
[16451.490247] RTAI[usi]: enabled.
[16451.562991] RTAI[math]: loaded.
[16451.659882] config string '0x378 out '
[16451.680560] creating ladder-state
[16526.423996] RTAI[math]: unloaded.
[16526.476158] SCHED releases registered named ALIEN RTGLBH
[16526.508525] RTAI[malloc]: unloaded.
[16526.608022] RTAI[sched]: unloaded (forced hard/soft/hard transitions: traps 0, syscalls 0).
[16526.612852] I-pipe: Domain RTAI unregistered.
[16526.612905] RTAI[hal]: unmounted.
[17852.861844] I-pipe: Domain RTAI registered.
[17852.861854] RTAI[hal]: <3.8.1> mounted over IPIPE-NOTHREADS 2.6-03.
[17852.861858] RTAI[hal]: compiled with gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5) .
[17852.861899] RTAI[hal]: mounted (IPIPE-NOTHREADS, IMMEDIATE (INTERNAL IRQs DISPATCHED), ISOL_CPUS_MASK: 0).
[17852.861902] PIPELINE layers:
[17852.861906] f84fbe20 9ac15d93 RTAI 200
[17852.861910] c085cb20 0 Linux 100
[17852.889331] RTAI[malloc]: global heap size = 2097152 bytes, <BSD>.
[17852.889519] RTAI[sched]: IMMEDIATE, MP, USER/KERNEL SPACE: <with RTAI OWN KTASKs>, kstacks pool size = 524288 bytes.
[17852.889527] RTAI[sched]: hard timer type/freq = APIC/8333578(Hz); default timing: periodic; linear timed lists.
[17852.889532] RTAI[sched]: Linux timer freq = 250 (Hz), TimeBase freq = 1600037000 hz.
[17852.889535] RTAI[sched]: timer setup = 999 ns, resched latency = 2943 ns.
[17852.889665] RTAI[usi]: enabled.
[17852.967683] RTAI[math]: loaded.
[17853.063112] config string '0x378 out '
[17853.081560] creating ladder-state
[17903.768491] 50750: ERROR: Unexpected realtime delay: check dmesg for details.
[17903.768498]
[17903.768499] In recent history there were
[17903.768500] 1601328, 1594704, 1597776, 1596804, and 1599720
[17903.768502] elapsed clocks between calls to the motion controller.
[17903.768506] This time, there were 1922472 which is so anomalously
[17903.768507] large that it probably signifies a problem with your
[17903.768508] realtime configuration. For the rest of this run of
[17903.768510] EMC, this message will be suppressed.
[17903.768519]
[18139.922601] RTAI[math]: unloaded.
[18139.977390] SCHED releases registered named ALIEN RTGLBH
[18140.008458] RTAI[malloc]: unloaded.
[18140.108019] RTAI[sched]: unloaded (forced hard/soft/hard transitions: traps 0, syscalls 0).
[18140.113283] I-pipe: Domain RTAI unregistered.
[18140.113333] RTAI[hal]: unmounted.
[19516.048891] I-pipe: Domain RTAI registered.
[19516.048901] RTAI[hal]: <3.8.1> mounted over IPIPE-NOTHREADS 2.6-03.
[19516.048905] RTAI[hal]: compiled with gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5) .
[19516.048947] RTAI[hal]: mounted (IPIPE-NOTHREADS, IMMEDIATE (INTERNAL IRQs DISPATCHED), ISOL_CPUS_MASK: 0).
[19516.048951] PIPELINE layers:
[19516.048955] f9589e20 9ac15d93 RTAI 200
[19516.048959] c085cb20 0 Linux 100
[19516.076390] RTAI[malloc]: global heap size = 2097152 bytes, <BSD>.
[19516.076612] RTAI[sched]: IMMEDIATE, MP, USER/KERNEL SPACE: <with RTAI OWN KTASKs>, kstacks pool size = 524288 bytes.
[19516.076619] RTAI[sched]: hard timer type/freq = APIC/8333578(Hz); default timing: periodic; linear timed lists.
[19516.076624] RTAI[sched]: Linux timer freq = 250 (Hz), TimeBase freq = 1600037000 hz.
[19516.076627] RTAI[sched]: timer setup = 999 ns, resched latency = 2943 ns.
[19516.076757] RTAI[usi]: enabled.
[19516.143535] RTAI[math]: loaded.
[19516.240684] config string '0x378 out '
[19516.260373] creating ladder-state

Phewww very large dmesg file. Dmesg says that I don't have good computer to run EMC. Other than that I don't see reason for not making my file.
I tried whole system search and I did not find anything (maybe it tries to make file somewhere but it can't as you said). On the other side, I have admin rights on system.

The only reason i wanted to run postgui hal custom commands is to make smaller .txt file - so I figured custom_postgui.hal runs after custom.hal => lesser commands sent => smaller .txt file.

No worries. I am sticking to custom.hal - it does the work.

inside a HAL file try :
halcmd loadusr 'your commands here'