$nproc
2
$nproc --ignore=1
1
$grep -c ^processor /proc/cpuinfo
2
$cat /proc/cpuinfo | awk '/^processor/{print $3=$3+1}' | tail -1
2
$cat /proc/cpuinfo | awk '/^processor/{print $3}'
0
1
$lscpu | grep CPU
CPU op-mode(s): 32-bit, 64-bit
CPU(s): 2
On-line CPU(s) list: 0,1
CPU family: 21
CPU MHz: 2800.000
CPU max MHz: 3000.0000
CPU min MHz: 1400.0000
NUMA node0 CPU(s): 0,1
$lscpu | grep "CPU(s)"
CPU(s): 2
On-line CPU(s) list: 0,1
NUMA node0 CPU(s): 0,1
$lscpu | grep "CPU(s):"
CPU(s): 2
NUMA node0 CPU(s): 0,1
$lscpu | grep ^"CPU(s):"
CPU(s): 2
$lscpu | awk 'FNR == 4 {print $2}'
2
$
$sudo cat /sys/class/net/eth0/speed
100
$sudo cat /sys/class/net/eth0/ca
carrier carrier_changes
$sudo cat /sys/class/net/eth0/carrier
1
$sudo cat /sys/class/net/eth0/carrier_changes
2
$sudo cat /sys/class/net/eth0/operstate
up
$sudo ethtool eth0
Settings for eth0:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Advertised pause frame use: Symmetric Receive-only
Advertised auto-negotiation: Yes
Link partner advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Link partner advertised pause frame use: Symmetric Receive-only
Link partner advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: MII
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: pumbg
Wake-on: g
Current message level: 0x00000033 (51)
drv probe ifdown ifup
Link detected: yes
$
http://www.ostechnix.com/how-to-find-out-the-connected-
state-of-a-network-cable-in-linux/
times() stores the current process times in
the struct tms that buf points to.
The struct tms is as defined in <sys/times.h>:
struct tms {
clock_t tms_utime; /* user time */
clock_t tms_stime; /* system time */
clock_t tms_cutime; /* user time of children */
clock_t tms_cstime; /* system time of children */
};
$httping -U www.beautifulwork.org
No URL/host to ping given
$httping -U http://www.beautifulwork.org
No URL/host to ping given
$httping http://www.beautifulwork.org
PING www.beautifulwork.org:80 (/):
connected to 89.36.208.169:80 (224 bytes), seq=0 time=455.10 ms
connected to 89.36.208.169:80 (224 bytes), seq=1 time=458.34 ms
connected to 89.36.208.169:80 (224 bytes), seq=2 time=447.45 ms
^CGot signal 2
--- http://www.beautifulwork.org/ ping statistics ---
4 connects, 3 ok, 0.00% failed, time 4418ms
round-trip min/avg/max = 447.5/453.6/458.3 ms
$httping -U anonymous http://www.beautifulwork.org
$httping -U anonymous http://www.beautifulwork.org
PING www.beautifulwork.org:80 (/):
connected to 89.36.208.169:80 (224 bytes), seq=0 time=453.33 ms
connected to 89.36.208.169:80 (224 bytes), seq=1 time=459.89 ms
connected to 89.36.208.169:80 (224 bytes), seq=2 time=451.59 ms
connected to 89.36.208.169:80 (224 bytes), seq=3 time=455.54 ms
connected to 89.36.208.169:80 (224 bytes), seq=4 time=448.82 ms
^CGot signal 2
--- http://www.beautifulwork.org/ ping statistics ---
5 connects, 5 ok, 0.00% failed, time 6948ms
round-trip min/avg/max = 448.8/453.8/459.9 ms
$httping -U userfoo http://www.beautifulwork.org
PING www.beautifulwork.org:80 (/):
connected to 89.36.208.169:80 (224 bytes), seq=0 time=449.55 ms
connected to 89.36.208.169:80 (224 bytes), seq=1 time=462.89 ms
connected to 89.36.208.169:80 (224 bytes), seq=2 time=446.10 ms
connected to 89.36.208.169:80 (224 bytes), seq=3 time=445.94 ms
^CGot signal 2
--- http://www.beautifulwork.org/ ping statistics ---
4 connects, 4 ok, 0.00% failed, time 5721ms
round-trip min/avg/max = 445.9/451.1/462.9 ms
$httping -U userfoo -P withfoo http://www.beautifulwork.org
PING www.beautifulwork.org:80 (/):
connected to 89.36.208.169:80 (224 bytes), seq=0 time=459.03 ms
connected to 89.36.208.169:80 (224 bytes), seq=1 time=445.85 ms
connected to 89.36.208.169:80 (224 bytes), seq=2 time=489.32 ms
connected to 89.36.208.169:80 (224 bytes), seq=3 time=461.37 ms
^CGot signal 2
--- http://www.beautifulwork.org/ ping statistics ---
4 connects, 4 ok, 0.00% failed, time 5614ms
round-trip min/avg/max = 445.8/463.9/489.3 ms
$httping -f http://www.beautifulwork.org
PING www.beautifulwork.org:80 (/):
connected to 89.36.208.169:80 (224 bytes), seq=0 time=458.52 ms
connected to 89.36.208.169:80 (224 bytes), seq=1 time=447.23 ms
connected to 89.36.208.169:80 (224 bytes), seq=2 time=442.29 ms
connected to 89.36.208.169:80 (224 bytes), seq=3 time=444.83 ms
connected to 89.36.208.169:80 (224 bytes), seq=4 time=456.58 ms
connected to 89.36.208.169:80 (224 bytes), seq=5 time=446.09 ms
connected to 89.36.208.169:80 (224 bytes), seq=6 time=447.35 ms
^CGot signal 2
--- http://www.beautifulwork.org/ ping statistics ---
8 connects, 7 ok, 12.50% failed, time 3580ms
round-trip min/avg/max = 442.3/449.0/458.5 ms
$
$cat /proc/meminfo
MemTotal: 3495924 kB
MemFree: 1465276 kB
MemAvailable: 2353604 kB
Buffers: 126008 kB
Cached: 962924 kB
SwapCached: 0 kB
Active: 1330576 kB
Inactive: 452848 kB
Active(anon): 695532 kB
Inactive(anon): 29420 kB
Active(file): 635044 kB
Inactive(file): 423428 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 7259132 kB
SwapFree: 7259132 kB
Dirty: 232 kB
Writeback: 0 kB
AnonPages: 694488 kB
Mapped: 291508 kB
Shmem: 30464 kB
Slab: 97912 kB
SReclaimable: 65988 kB
SUnreclaim: 31924 kB
KernelStack: 7808 kB
PageTables: 30060 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 9007092 kB
Committed_AS: 3508024 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 0 kB
VmallocChunk: 0 kB
HardwareCorrupted: 0 kB
AnonHugePages: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 198692 kB
DirectMap2M: 3432448 kB
DirectMap1G: 0 kB
$
https://blogs.oracle.com/cwb/entry/so_what_the_heck_is
$shopt -s
checkwinsize on
cmdhist on
complete_fullquote on
expand_aliases on
extglob on
extquote on
force_fignore on
histappend on
interactive_comments on
progcomp on
promptvars on
sourcepath on
$shopt -s cdspell
$shopt -s
cdspell on
checkwinsize on
cmdhist on
complete_fullquote on
expand_aliases on
extglob on
extquote on
force_fignore on
histappend on
interactive_comments on
progcomp on
promptvars on
sourcepath on
$shopt -s gnu
bash: shopt: gnu: invalid shell option name
$cd /etc/ap
apache2/ apm/ apparmor/ apparmor.d/ apport/ apt/
$cd /etc/apache3
/etc/apache2
$pwd
/etc/apache2
$
http://www.gnu.org/software/bash/manual/html_node/The-Shopt-Builtin.html
$cat a.txt
hello
$cat b.txt
killo
$ls
1 a.txt b.txt l.txt trueangle u.txt
$cat u.txt
UPPERCASE
$cat l.txt
uppercase
$cat a.txt >> b.txt >> l.txt >> u.txt
$cat u.txt
UPPERCASE
hello
$cat a.txt
hello
$cat
1 a.txt b.txt l.txt trueangle/ u.txt
$cat l.txt
uppercase
$cat a.txt
hello
$cat a.txt >> b.txt
$cat b.txt
killo
hello
$cat l.txt >> u.txt
$cat u.txt
UPPERCASE
hello
uppercase
$paste b.txt u.txt > final.txt
$cat final.txt
killo UPPERCASE
hello hello
uppercase
$sort -t: -k1 final.txt
hello hello
killo UPPERCASE
uppercase
$