Last login: Wed Mar 29 10:24:23 on ttys000
D-69-91-139-113:~ emullen$ ssh emullen@klaatu.cs.washington.edu
emullen@klaatu.cs.washington.edu's password: 
Last login: Wed Mar 29 10:24:31 2017 from goedel-1.dyn.cs.washington.edu
[emullen@klaatu ~]$ ls
test.sh
[emullen@klaatu ~]$ bash
[emullen@klaatu ~]$ ls
test.sh
[emullen@klaatu ~]$ PATH=/
[emullen@klaatu ~]$ ls
bash: ls: command not found
[emullen@klaatu ~]$ exit
exit
[emullen@klaatu ~]$ echo $PATH
/usr/kerberos/sbin:/usr/kerberos/bin:/opt/rh/devtoolset-4/root/usr/bin:/opt/rh/rh-java-common/root/usr/bin:/opt/rh/rh-maven33/root/usr/bin:/opt/rh/sclo-git25/root/usr/bin:/opt/rh/sclo-subversion19/root/usr/bin:/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/homes/emullen/.local/bin:/homes/emullen/bin
[emullen@klaatu ~]$ bash
[emullen@klaatu ~]$ ps
  PID TTY          TIME CMD
21317 pts/0    00:00:00 bash
21527 pts/0    00:00:00 bash
21551 pts/0    00:00:00 ps
[emullen@klaatu ~]$ exit
exit
[emullen@klaatu ~]$ ps
  PID TTY          TIME CMD
21317 pts/0    00:00:00 bash
21561 pts/0    00:00:00 ps
[emullen@klaatu ~]$ ls
test.sh
[emullen@klaatu ~]$ cat test.sh 
echo $1
[emullen@klaatu ~]$ chmod +x test.sh 
[emullen@klaatu ~]$ ./test.sh hello
hello
[emullen@klaatu ~]$ test.sh
-bash: test.sh: command not found
[emullen@klaatu ~]$ ./test.sh *
test.sh
[emullen@klaatu ~]$ ./test.sh "*"
test.sh
[emullen@klaatu ~]$ ./test.sh '*'
test.sh
[emullen@klaatu ~]$ ./test.sh \*
test.sh
[emullen@klaatu ~]$ ./test.sh '\*'
\*
[emullen@klaatu ~]$ cat test.sh 
echo $1
[emullen@klaatu ~]$ ./test.sh '"*"'
"*"
[emullen@klaatu ~]$ history
...Elided because I forgot to clear it...
  185  ls
  186  bash
  187  echo $PATH
  188  bash
  189  ps
  190  ls
  191  cat test.sh 
  192  chmod +x test.sh 
  193  ./test.sh hello
  194  test.sh
  195  ./test.sh *
  196  ./test.sh "*"
  197  ./test.sh '*'
  198  ./test.sh \*
  199  ./test.sh '\*'
  200  cat test.sh 
  201  ./test.sh '"*"'
  202  history
[emullen@klaatu ~]$ !!
history
...Elided because I forgot to clear it...
  185  ls
  186  bash
  187  echo $PATH
  188  bash
  189  ps
  190  ls
  191  cat test.sh 
  192  chmod +x test.sh 
  193  ./test.sh hello
  194  test.sh
  195  ./test.sh *
  196  ./test.sh "*"
  197  ./test.sh '*'
  198  ./test.sh \*
  199  ./test.sh '\*'
  200  cat test.sh 
  201  ./test.sh '"*"'
  202  history
[emullen@klaatu ~]$ !./
./test.sh '"*"'
"*"
[emullen@klaatu ~]$ alias best_editor=emacs
[emullen@klaatu ~]$ best_editor test.sh
[emullen@klaatu ~]$ ./test.sh "*"
*
[emullen@klaatu ~]$ PS1=raspberry
raspberryls
strawberry  test.sh  test.sh~
raspberryPS1=something_else
something_elsecat test.sh
echo "$1"