_every directory has a parent directory
"the
relative pathname for the parent directory is '..'
"the
relative pathname for the current directory is '.'
_commands:
"ls, ls -a, ls -al, ls -alt, ls -altr, cd
~/AFNI_data1/afni
"ls -l, wc ideal_r1.1D, cat idea_r1.1D, less
ideal_r1.1D
_'less':
a file perusal program
"basic
keystrokes while running less: Enter, Space, b, g, G, h, q
"command: less
rall_vr+orig.HEAD
¥Programs
_a program is something that gets "executed",
or "run"
_the first element of a command line is generally a
program
_commands:
"echo the home directory of $USER is $HOME
"ls ~ ~/AFNI_data1
~/AFNI_data1/afni/ideal_r1.1D
_script: an interpreted program (interpreted by another
program)
"e.g.
consider the c00.all
script: cat ~/AFNI_data1/ht03/c00.all