Co' 2 vi' du. nho? sau:
# 1:
y=2
x=`expr $y + 3`
# 2:
y=2
x="$(expr $y + 3)"
Co' the^? la` 2 scripts tre^n de^`u co' chu+'c na(ng gio^'ng nhau, nhu+ng
lie^.u co' gi` kha'c bie^.t quan tro.ng nu+~a kho^ng ? Be^n ca.nh do', o+?
vi' du. 2 thi` expr $y + 3 -> 5 ro^`i x="$5" ne^n ne^'u no'i ga'n con so^' 5
cho x se~ kho^ng ho+.p li' la('m. Nhi`n va`o doa.n script linuxrc. cu?a
vnlinuxCD.
RAMSIZE="$(expr $TOTALMEM / 3)"
thi` cha('c cha('n la`ga'n cho RAMSIZE la` gia' tri. cu?a bie^'n TOTALMEM
chia cho 3.
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