free Linux Commands
What is Linux free Command?
Explanation
free COMMAND:free command displays information about free and used memory on the system.SYNTAX :
free [options] [-V]OPTIONS:
- b
Prints the memory information in bytes.
- k
Prints the memory information in kilo-bytes.
- m
Prints the memory information in mega-bytes.
- s delay
Prints the output continously. Type the delay time to print the output continously.
- t
prints a line containing totals.
EXAMPLE:
- To Print the memory size information:
free
total
used
free
shared buffers cached
Mem:
223740
219492
4248
0
3756
73212
-/+ buffers/cache: 142524
81216
Swap:
1052216
66732
985484
The free command displays all the memory information of the system like total memory used and free memory.
- To Print memory information from file:
cat /proc/meminfo
MemTotal:
223740 kB
MemFree:
8512 kB
Buffers:
4432 kB
Cached:
67860 kB
SwapCached:
15032 kB
Active:
172484 kB
Inactive:
20168 kB
HighTotal:
0 kB
HighFree:
0 kB
LowTotal:
223740 kB
LowFree:
8512 kB
SwapTotal:
1052216 kB
SwapFree:
985488 kB
Dirty:
52 kB
Writeback:
0 kB
Mapped:
166064 kB
Slab:
14860 kB
Committed_AS:
541000 kB
PageTables:
3260 kB
VmallocTotal:
794616 kB
VmallocUsed:
3056 kB
VmallocChunk:
791084 kB
HugePages_Total:
0
HugePages_Free:
0
Hugepagesize:
4096 kB
The above command prints the memory information of the system.
free [options] [-V]
OPTIONS:
- b
Prints the memory information in bytes.
- k
Prints the memory information in kilo-bytes.
- m
Prints the memory information in mega-bytes.
- s delay
Prints the output continously. Type the delay time to print the output continously.
- t
prints a line containing totals.
EXAMPLE:
- To Print the memory size information:
free
total
used
free
shared buffers cached
Mem:
223740
219492
4248
0
3756
73212
-/+ buffers/cache: 142524
81216
Swap:
1052216
66732
985484
The free command displays all the memory information of the system like total memory used and free memory.
- To Print memory information from file:
cat /proc/meminfo
MemTotal:
223740 kB
MemFree:
8512 kB
Buffers:
4432 kB
Cached:
67860 kB
SwapCached:
15032 kB
Active:
172484 kB
Inactive:
20168 kB
HighTotal:
0 kB
HighFree:
0 kB
LowTotal:
223740 kB
LowFree:
8512 kB
SwapTotal:
1052216 kB
SwapFree:
985488 kB
Dirty:
52 kB
Writeback:
0 kB
Mapped:
166064 kB
Slab:
14860 kB
Committed_AS:
541000 kB
PageTables:
3260 kB
VmallocTotal:
794616 kB
VmallocUsed:
3056 kB
VmallocChunk:
791084 kB
HugePages_Total:
0
HugePages_Free:
0
Hugepagesize:
4096 kB
The above command prints the memory information of the system.
| - b | Prints the memory information in bytes. |
| - k | Prints the memory information in kilo-bytes. |
| - m | Prints the memory information in mega-bytes. |
| - s delay | Prints the output continously. Type the delay time to print the output continously. |
| - t | prints a line containing totals. |
- To Print the memory size information:free
total
used
free
shared buffers cached Mem:
223740
219492
4248
0
3756
73212 -/+ buffers/cache: 142524
81216 Swap:
1052216
66732
985484
The free command displays all the memory information of the system like total memory used and free memory. - To Print memory information from file:cat /proc/meminfo
MemTotal:
223740 kB MemFree:
8512 kB Buffers:
4432 kB Cached:
67860 kB SwapCached:
15032 kB Active:
172484 kB Inactive:
20168 kB HighTotal:
0 kB HighFree:
0 kB LowTotal:
223740 kB LowFree:
8512 kB SwapTotal:
1052216 kB SwapFree:
985488 kB Dirty:
52 kB Writeback:
0 kB Mapped:
166064 kB Slab:
14860 kB Committed_AS:
541000 kB PageTables:
3260 kB VmallocTotal:
794616 kB VmallocUsed:
3056 kB VmallocChunk:
791084 kB HugePages_Total:
0 HugePages_Free:
0 Hugepagesize:
4096 kB
The above command prints the memory information of the system.
