If You Know Id and Pid Can You Find Out Sid

In this article, we will wait at how to detect a process name by its procedure identification number (PID). Before we dive into the actual solution, let united states briefly talk nearly how processes are created and identified by Linux.

Every fourth dimension a user or the organization (Linux) launches a programme, the kernel will create a process. A process holds execution details of the programme in memory such as its input and output information, variables and then on.

Chiefly, since Linux is a multitasking operating arrangement, it executes several programs simultaneously, and this means each process process must exist identified specifically.

The kernel identifies each process using a process ID (PID), a every case of process must have a unique PID from other processes which is assigned when the procedure is invoked, to avoid any execution errors.

The /proc file arrangement stores information nigh currently running processes on your organization, it contains directories for each process.

Use the ls command to list its contents, however, the listing may be long, so employ a pipeline and the less utility to view the /proc contents in a more convenient way as below:

$ ls /proc  OR $ ls /proc | less        

List /proc File System

ane     168   2230  25    329   584   7386  83         driver        schedstat x    169   2234  2503  33    603   74    830        execdomains   scsi 1070  17    2247  2507  34    610   7411  833        fb            self 1081  1702  2256  2523  349   611   7423  836        filesystems   slabinfo 109   1714  2258  253   35    612   745   839        fs            softirqs 11    173   2266  2551  36    613   746   84         interrupts    stat 110   1760  2273  26    362   62    75    844        iomem         swaps 1188  1763  2278  2688  3642  63    7533  85         ioports       sys 12    1769  2282  2694  3643  64    7589  86         irq           sysrq-trigger 1204  177   2283  2695  37    6436  76    860        kallsyms      sysvipc 1209  1773  2285  2698  38    65    7619  87         kcore         thread-self 1254  18    2287  2699  39    66    7689  9          keys          timer_list 13    1847  2295  27    3974  67    7690  94         fundamental-users     timer_stats fifteen    1914  23    2702  3976  68    77    977        kmsg          tty 152   1917  2308  28    4273  6897  7725  981        kpagecgroup   uptime 153   1918  2309  280   4374  69    7729  987        kpagecount    version 154   1938  2310  2815  4392  6969  7733  997        kpageflags    version_signature 155   1956  2311  2817  44    6980  78    acpi       loadavg       vmallocinfo 156   1981  2315  282   45    7     79    asound     locks         vmstat 1565  1986  2316  283   4543  seventy    790   buddyinfo  mdstat        zoneinfo 1567  1988  2317  29    46    71    8     bus        meminfo 157   2     2324  2935  461   7102  80    cgroups    misc 1579  20    2347  2944  4686  72    808   cmdline    modules 158   2010  2354  3     47    73    81    consoles   mounts 1584  2043  2436  30    4700  7304  810   cpuinfo    mtrr 159   2044  2437  3016  5     7311  815   crypto     net 1590  21    2442  31    515   7322  82    devices    pagetypeinfo 16    2167  2443  318   5273  7347  820   diskstats  partitions 160   22    2492  32    5274  7367  823   dma        sched_debug        

From the screenshot to a higher place, the numbered directories shop information files nigh the processes in execution, where each number corresponds to a PID.

Below is the list of files for systemd process with PID ane:

$ ls /proc/1        

Show SystemD Process PID

ls: cannot read symbolic link '/proc/i/cwd': Permission denied ls: cannot read symbolic link '/proc/1/root': Permission denied ls: cannot read symbolic link '/proc/1/exe': Permission denied attr        coredump_filter  gid_map    mountinfo   oom_score      schedstat  status autogroup   cpuset           io         mounts      oom_score_adj  sessionid  syscall auxv        cwd              limits     mountstats  pagemap        setgroups  chore cgroup      environ          loginuid   net         personality    smaps      timers clear_refs  exe              map_files  ns          projid_map     stack      uid_map cmdline     fd               maps       numa_maps   root           stat       wchan comm        fdinfo           mem        oom_adj     sched          statm        

You tin monitor processes and their PIDs using traditional Linux commands such as ps, pinnacle and relatively new glances command plus many more than as in the examples below:

$ ps aux        

Testify Running Processes with PID

USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   Fourth dimension COMMAND root         1  0.0  0.0 185728  6268 ?        Ss   10:fifteen   0:01 /sbin/init splash root         two  0.0  0.0      0     0 ?        S    10:fifteen   0:00 [kthreadd] root         3  0.0  0.0      0     0 ?        Southward    x:15   0:00 [ksoftirqd/0] root         5  0.0  0.0      0     0 ?        S<   10:15   0:00 [kworker/0:0H] root         7  0.0  0.0      0     0 ?        S    10:15   0:09 [rcu_sched] root         8  0.0  0.0      0     0 ?        S    10:15   0:00 [rcu_bh] root         9  0.0  0.0      0     0 ?        S    10:15   0:00 [migration/0] root        10  0.0  0.0      0     0 ?        S    10:15   0:00 [watchdog/0] root        11  0.0  0.0      0     0 ?        S    10:fifteen   0:00 [watchdog/one] root        12  0.0  0.0      0     0 ?        S    ten:15   0:00 [migration/i] root        13  0.0  0.0      0     0 ?        S    10:fifteen   0:00 [ksoftirqd/1] root        15  0.0  0.0      0     0 ?        S<   x:15   0:00 [kworker/1:0H] root        xvi  0.0  0.0      0     0 ?        S    ten:fifteen   0:00 [watchdog/ii] root        17  0.0  0.0      0     0 ?        S    x:15   0:00 [migration/2] root        18  0.0  0.0      0     0 ?        S    x:15   0:00 [ksoftirqd/two] root        20  0.0  0.0      0     0 ?        S<   10:xv   0:00 [kworker/2:0H] root        21  0.0  0.0      0     0 ?        Due south    10:15   0:00 [watchdog/3] root        22  0.0  0.0      0     0 ?        South    10:15   0:00 [migration/3] root        23  0.0  0.0      0     0 ?        Southward    10:15   0:00 [ksoftirqd/3] root        25  0.0  0.0      0     0 ?        S<   10:fifteen   0:00 [kworker/3:0H] root        26  0.0  0.0      0     0 ?        S    10:fifteen   0:00 [kdevtmpfs] root        27  0.0  0.0      0     0 ?        South<   10:fifteen   0:00 [netns] root        28  0.0  0.0      0     0 ?        S<   10:xv   0:00 [perf] ....        

Monitor Linux processes using traditional superlative control.

$ meridian        

Monitor Linux Processes with elevation Command

Monitor Linux processes using glances, a new existent-time process monitoring tool for Linux.

$ glances        

Glances – Real Time Linux Processes Monitoring

Learn more than about how to install Glances in Linux systems.

Notice Out Process PID Number

To find out the PID of a process, y'all can use pidof, a simple command to print out the PID of a process:

$ pidof firefox $ pidof python $ pidof cinnamon        

Detect Linux Process PID

Coming back to our point of focus, bold you already know the PID of a process, you can print its proper noun using the command form below:

$ ps -p PID -o format        

Where:

1. -p specifies the PID
2. -o format enables a user-defined format

Observe Out Process Proper name Using PID Number

In this section, nosotros volition see how to notice out a process proper noun using its PID number with the help of user divers format i.e comm= which ways control proper noun, same as the procedure name.

$ ps -p 2523 -o comm= $ ps -p 2295 -o comm=        

Find Linux Process Name

For additional usage data and options, expect through the ps man page.

$ human being ps        

If you want to kill a process using its PID number, I suggest you to read Find and Kill Linux Processes Using its PID.

Thats it for the moment, if you know whatsoever other ameliorate way to find out a procedure proper noun using PID, do share with usa via our annotate section beneath.

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