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first steps and basic output
how shell reads input - three methods
use of "echo" built-in utility
ex: hello world
simple commands, field splitting, and quoting
ex: maybe cd, mkdir/touch, etc.
tilde and pathname expansion
ex: cd with tildes
ex: cd/mkdir/touch with pathname expansions
parameters
defining variables and expanding their values
positional parameters, special parameters, and shell variables
ex: assign variables
ex: expand and print variables and positional parameters
command substitution
ex: commands in subshells, output assigned to variables
arithmetic expansion
ex: some expressions, assignments, etc.
shell commands
revisit simple commands
command search and execution
pipelines
lists
sequential
asynchronous
AND
OR
compound commands
grouping
subshell vs current shell, shell execution environment:
open files
working directory
shell parameters
shell functions
shell options
shell aliases
if
show "test"/"[" command
while
ex: loop over positional parameters
#! /bin/sh
while [ $# -gt 0 ]; do
printf '%s\n' "$1"
shift
done
ex: read from input
until
for
case
functions
exit status
I/O redirection
built-in utilities
colon
export
break [n]
continue [n]
dot
eval
exec
exit
export
return
set
shift
unset
utilities
cat
cd
chgrp
chmod
chown
cp
date
dd
df
diff
dirname
du
echo
expr
false
file
fold
getopts
grep
head
id
kill
ln
lp
ls
mailx
mesg
mkdir
mkfifo
more
mv
nice
pr
printf
ps
pwd
read
rm
rmdir
sed
sh
sleep
sort
stty
tail
test
time
touch
tr
true
uniq
wc
who
example scripts:
screen-batt
/usr/local/lib/pjrand.sh and /usr/local/bin/screensaver
/bin/which of Debian (ex. of IFS)
changelog-gen
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