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#### 查看内存使用
$ free
total used free shared buff/cache available
Mem: 131920400 1039696 60624308 66203260 70256396 64246780
Swap: 0 0 0
## 改变显示单位
$ free -g
total used free shared buff/cache available
Mem: 125 0 57 63 67 61
Swap: 0 0 0
$ free -m
total used free shared buff/cache available
Mem: 128828 1014 59119 64651 68694 62741
Swap: 0 0 0#### 硬盘使用量
$ df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/vg_root-lv_root 20511356 2613276 16833120 14% /
devtmpfs 65949600 0 65949600 0% /dev
tmpfs 65960200 65960200 0 100% /dev/shm
tmpfs 65960200 243060 65717140 1% /run
tmpfs 65960200 0 65960200 0% /sys/fs/cgroup
/dev/sda1 194241 157511 22394 88% /boot
/dev/mapper/vg_root-lv_home 2271859724 844917528 1311515280 40% /home
## 人类可读
$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_root-lv_root 20G 2.5G 17G 14% /
devtmpfs 63G 0 63G 0% /dev
tmpfs 63G 63G 0 100% /dev/shm
tmpfs 63G 238M 63G 1% /run
tmpfs 63G 0 63G 0% /sys/fs/cgroup
/dev/sda1 190M 154M 22M 88% /boot
/dev/mapper/vg_root-lv_home 2.2T 806G 1.3T 40% /home#### 文件夹总体占用空间
$ du -s work
839499392 work
# -s: summary
## 人类可读
$ du -sh work
801G work
# -h: human readable
## 多个文件夹
$ du -sh work core
801G work
4.2G core
## 统计多个文件夹总占用量
$ du -shc work core
801G work
4.2G core
805G total#### 查看CPU详细信息
## 处理器数量: CPUs = Threads per core X cores per socket X sockets
$ lscpu | grep -E '^Thread|^Core|^Socket|^CPU\('
CPU(s): 8
Thread(s) per core: 2
Core(s) per socket: 4
Socket(s): 1
## 产看更多cpu概览信息
$ lscpu
...
## 查看cpu详细信息
$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 94
model name : Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz
stepping : 3
microcode : 0xc6
cpu MHz : 844.289
cache size : 8192 KB
physical id : 0
siblings : 8
core id : 0
cpu cores : 4
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 22
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch epb invpcid_single intel_pt ssbd ibrs ibpb stibp kaiser tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx rdseed adx smap clflushopt xsaveopt xsavec xgetbv1 dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp flush_l1d
bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf
bogomips : 6815.75
clflush size : 64
cache_alignment : 64
address sizes : 39 bits physical, 48 bits virtual
power management:
...#### 搜索路径下符合规则的文件名
$ find . -name "*2\.cpp"
./PerformanceOptimizaition/Code/timecompare/02.cpp
./PerformanceOptimizaition/Code/itoa/src/sse2.cpp
./PerformanceOptimizaition/Code/itoa/src/tmp/branchlut2.cpp
./Algorithm/Other/02.cpp
./Algorithm/LeetCode/0000-0050/00152.cpp
./Algorithm/LeetCode/0000-0050/0012.cpp
./Algorithm/LeetCode/0000-0050/002.cpp
./Algorithm/SwordToOffer/12.cpp
./C++/Code/Pointer/02.cpp
./C++/Code/12.cpp
./C++/Code/NowCode/002.cpp
./C++/Code/Learn/02.cpp
#### 搜索路径下包含特定字符串的文件
$ grep -rnwl . -e 'greater' --include=\*.cpp
./C++/Code/NowCode/002.cpp
## 参数说明
# -r OR -R: recursive
# -i: 忽略大小写
# -n: line number
# -w: match whole word
# -l: 只给出文件名
## 筛选文件
# --include
# grep --include=\*.{c,h} -rnw '/path/to/somewhere/' -e "pattern"
# --exclude
# grep --exclude=*.o -rnw '/path/to/somewhere/' -e "pattern"
# --exclude-dir
# grep --exclude-dir={dir1,dir2,*.dst} -rnw '/path/to/somewhere/' -e "pattern"