求助命令流问题

下面这一段命令流中，化成红线的什么意思，可以不用看其他的命令，就看红色的那一句就可以了，谢谢啊
!EX2.1--平面桁架分析
finish
/clear
/filname,ex1p1
/title,The Analysis of Plane truss
/prep7
k,1
k,2,2
k,3,2,1
k,4,4,2
k,5,4
k,6,6
k,7,6,1
k,8,8
*do,i,1,7
l,i,i+1
*enddo
l,1,3
l,2,5
l,4,7
l,6,8
l,3,5
l,5,7
et,1,link1
r,1,0.0144
mp,ex,1,8.5e9
mp,prxy,1,0.2
latt,1,1,1
lesize,all,,,1
lmesh,all
dk,1,ux,,,,uy
dk,8,uy
fk,1,fy,-1e4
fk,3,fy,-2e4
fk,4,fy,-1e4
save
finish
!----------求解----------------------------
/solu
antype,0
solve
finish
!----------后处理-------------------------------
/post1
pldisp
etable,mforce,smisc,1
etable,mstress,ls,1
etable,mstr,lepel,1
plls,mforce,mforce,1
plls,mstress,mstress,1
plls,mstr,mstr,1
prrsol
midf=uy(node(4,0,0))
!--------------
resume
finish
/solu
antype,0
pstres,on
solve
finish
/solu
antype,1
bucopt,lanb,5
mxpand,5
solve
finish
/post1
set,list
set,1,1
pldisp,1