Homework & Coursework Questions

5000    Bash
300      zsh
0         sh

echo
echo "METHOD 3: Using only grep command"

echo -n "bash: "
grep "/bin/bash" /etc/passwd | wc -l

echo -n "zsh: "
grep "/bin/zsh" /etc/passwd | wc -l

echo -n "ssh: "
grep "/bin/sh" /etc/passwd | wc -l

for shell in bash ksh tcsh
do
 echo "$shell"
done

for shell in bash ksh tcsh
do
 path=$(which "$shell")
 echo "$shell: $path"
done

for shell in bash ksh tcsh
do
 path=$(which "$shell")
 echo -e "$shell\t$path" # you can exchange $shell and $path anytime
done

for shell in bash ksh tcsh
do
 path=$(which "$shell")
# First column format: 5 chars left-aligned
# Second column format: 15 chars right-aligned
 printf '%-5s %15s\n' "$shell" "$path"
done

5189 /bin/bash
2222 /bin/drop
     58 /bin/ksh
      1 /bin/sync
      6 /bin/zsh
      1 /sbin/halt
     33 /sbin/nologin
      1 /sbin/shutdown

5189 /bin/bash
58 /bin/ksh
 6 /bin/zsh