> > >
# gdb
gdb -c core_file bin_file
# text deduplication
sort filename|uniq -c > newfile
# show exit status
echo $?
# get timestamp
date +%s
# grep whole word
grep -w xxx
# human readable size
ls -lh
which
cat -n
# float number in bc
scale=2# All
uname -a
# host name
uname -n
# OS name
uname -s
# Kernel version
uname -r
# CPU info
cat /proc/cpuinfo
# resources
top
vmstat
iostat
mpstat
sar
df
htop