I have one script (sleeploop.sh) running in background and second (check.sh)
to test if sleeploop is running and if not then start it.
################################
[/opt/bin]$ cat sleeploop.sh
#!/bin/sh
while true
do
sleep 5
done
################################
[/opt/bin]$ cat check.sh
#!/bin/sh
_ret=$(ps aux | grep sleeploop.sh | grep -v grep | awk '{print $2}')
test -z ${_ret} && /opt/bin/sleeploop.sh &
################################
When i start check.sh from the shell it works fine; if there is no pid check.sh
starts sleeploop.sh, otherwise it gets the pid and exiting.
If i put check.sh in cron it spawns another sleeploop.sh process every time
when triggered.
dmesg:
OpenBSD 7.0 (GENERIC.MP) #1: Fri Oct 29 12:04:07 MDT 2021
[email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 1810530304 (1726MB)
avail mem = 1739616256 (1659MB)
random: good seed from bootblocks
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.7 @ 0xeb6b0 (91 entries)
bios0: vendor American Megatrends Inc. version "0608" date 08/10/2012
bios0: ASUSTeK COMPUTER INC. P8H61-M LX3 R2.0
acpi0 at bios0: ACPI 5.0
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP APIC FPDT MCFG HPET SSDT SSDT SSDT
acpi0: wakeup devices P0P1(S4) RP01(S4) PXSX(S4) RP02(S4) PXSX(S4) RP03(S4)
PXSX(S4) RP04(S4) PXSX(S4) RP05(S4) PXSX(S4) RP06(S4) PXSX(S4) PEG0(S4)
PEGP(S4) PEG1(S4) [...]
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Pentium(R) CPU G2020 @ 2.90GHz, 2900.44 MHz, 06-3a-09
cpu0:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,POPCNT,DEADLINE,XSAVE,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,FSGSBASE,SMEP,ERMS,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu0: 256KB 64b/line 8-way L2 cache
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 10 var ranges, 88 fixed ranges
cpu0: apic clock running at 100MHz
cpu0: mwait min=64, max=64, C-substates=0.2.1.1, IBE
cpu1 at mainbus0: apid 2 (application processor)
cpu1: Intel(R) Pentium(R) CPU G2020 @ 2.90GHz, 2900.04 MHz, 06-3a-09
cpu1:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,POPCNT,DEADLINE,XSAVE,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,FSGSBASE,SMEP,ERMS,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu1: 256KB 64b/line 8-way L2 cache
cpu1: smt 0, core 1, package 0
ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 24 pins
acpimcfg0 at acpi0
acpimcfg0: addr 0xf8000000, bus 0-63
acpihpet0 at acpi0: 14318179 Hz
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus -1 (P0P1)
acpiprt2 at acpi0: bus 2 (RP01)
acpiprt3 at acpi0: bus -1 (RP02)
acpiprt4 at acpi0: bus -1 (RP03)
acpiprt5 at acpi0: bus -1 (RP04)
acpiprt6 at acpi0: bus -1 (RP05)
acpiprt7 at acpi0: bus 3 (RP06)
acpiprt8 at acpi0: bus 1 (PEG0)
acpiprt9 at acpi0: bus -1 (PEG1)
acpiprt10 at acpi0: bus -1 (PEG2)
acpiprt11 at acpi0: bus -1 (PEG3)
acpiec0 at acpi0: not present
acpipci0 at acpi0 PCI0: 0x00000010 0x00000011 0x00000000
acpicmos0 at acpi0
acpibtn0 at acpi0: PWRB
"PNP0C0B" at acpi0 not configured
"PNP0C0B" at acpi0 not configured
"PNP0C0B" at acpi0 not configured
"PNP0C0B" at acpi0 not configured
"PNP0C0B" at acpi0 not configured
"PNP0C14" at acpi0 not configured
acpicpu0 at acpi0: C3(350@80 mwait.1@0x20), C2(500@59 mwait.1@0x10), C1(1000@1
mwait.1), PSS
acpicpu1 at acpi0: C3(350@80 mwait.1@0x20), C2(500@59 mwait.1@0x10), C1(1000@1
mwait.1), PSS
acpipwrres0 at acpi0: FN00, resource for FAN0
acpipwrres1 at acpi0: FN01, resource for FAN1
acpipwrres2 at acpi0: FN02, resource for FAN2
acpipwrres3 at acpi0: FN03, resource for FAN3
acpipwrres4 at acpi0: FN04, resource for FAN4
acpitz0 at acpi0: critical temperature is 106 degC
acpitz1 at acpi0: critical temperature is 106 degC
acpivideo0 at acpi0: GFX0
acpivout0 at acpivideo0: DD02
cpu0: using VERW MDS workaround (except on vmm entry)
cpu0: Enhanced SpeedStep 2900 MHz: speeds: 2900, 2800, 2700, 2600, 2500, 2400,
2300, 2200, 2100, 2000, 1900, 1800, 1700, 1600 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel Core 3G Host" rev 0x09
ppb0 at pci0 dev 1 function 0 "Intel Core 3G PCIE" rev 0x09: msi
pci1 at ppb0 bus 1
inteldrm0 at pci0 dev 2 function 0 "Intel HD Graphics 2500" rev 0x09
drm0 at inteldrm0
inteldrm0: msi, IVYBRIDGE, gen 7
"Intel 6 Series MEI" rev 0x04 at pci0 dev 22 function 0 not configured
ehci0 at pci0 dev 26 function 0 "Intel 6 Series USB" rev 0x05: apic 2 int 23
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00
addr 1
ppb1 at pci0 dev 28 function 0 "Intel 6 Series PCIE" rev 0xb5: msi
pci2 at ppb1 bus 2
ppb2 at pci0 dev 28 function 5 "Intel 6 Series PCIE" rev 0xb5: msi
pci3 at ppb2 bus 3
re0 at pci3 dev 0 function 0 "Realtek 8168" rev 0x09: RTL8168F/8111F (0x4800),
msi, address 50:46:5d:b2:4f:b1
rgephy0 at re0 phy 7: RTL8169S/8110S/8211 PHY, rev. 5
ehci1 at pci0 dev 29 function 0 "Intel 6 Series USB" rev 0x05: apic 2 int 23
usb1 at ehci1: USB revision 2.0
uhub1 at usb1 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00
addr 1
pcib0 at pci0 dev 31 function 0 "Intel H61 LPC" rev 0x05
ahci0 at pci0 dev 31 function 2 "Intel 6 Series AHCI" rev 0x05: msi, AHCI 1.3
ahci0: port 0: 3.0Gb/s
scsibus1 at ahci0: 32 targets
sd0 at scsibus1 targ 0 lun 0: <ATA, WDC WD5000AAKX-0, 15.0> naa.50014ee0adae5ddc
sd0: 476938MB, 512 bytes/sector, 976771055 sectors
ichiic0 at pci0 dev 31 function 3 "Intel 6 Series SMBus" rev 0x05: apic 2 int 18
iic0 at ichiic0
spdmem0 at iic0 addr 0x50: 2GB DDR3 SDRAM PC3-10600
isa0 at pcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0: console keyboard
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
wbsio0 at isa0 port 0x2e/2: NCT6779D rev 0x62
lm1 at wbsio0 port 0x290/8: NCT6779D
dt: 445 probes
uhub2 at uhub0 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev
2.00/0.00 addr 2
uhub3 at uhub1 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev
2.00/0.00 addr 2
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
root on sd0a (38ff446c5ef9d381.a) swap on sd0b dump on sd0b
inteldrm0: 1024x768, 32bpp
wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation), using wskbd0
wsdisplay0: screen 1-5 added (std, vt100 emulation)
