bash shell quick tips

some quick tips on bash shell programming

a) Variable set/access

varname='some text'
echo $varname

b) store command output to a variable

varname=`somecommand`
echo $varname

or,
an alternate way to do it
varname=$(some command)
echo $varname

eg. - to store current timestamp in a variable
current_timestamp=`date +%s`
echo $current_timestamp

c)s

eg

d)

eg

e)

eg

f)

eg

g)

eg