How to display in column format?

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1. The problem statement, all variables and given/known data:
   I would like to know how to display my output to this format below:

5000    Bash
300      zsh
0         sh

2. Relevant commands, code, scripts, algorithms:

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

Thank you,

3. The attempts at a solution (include all code and scripts):

4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):
   San Francisco City College. Professor: Aaron Brick

Note: Without school/professor/course information, you will be banned if you post here! You must complete the entire template (not just parts of it).

man grep and look at the flag -c

If you can follow and understand following code, you should be able to easily adjust it for you needs with only few minor modifications. Hope it helps.

Simple for loop:

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

Assigning value to variable in the for loop:

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

Column format, simplified, utilizing tabulator:

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

Column format, utilizing printf (for perfect alignment)

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

Thank you..... But I have written the new command lines to get these output below. But I only want to pick out .bash .ksh and .zsh. Is the only command I can use here is grep? How do I use the grep command to get rid of the line that I don't want? So my output will only have 3 lines left.

Thanks in advance,

Jeremy

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

output:

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

Howsoever you created your output, pipe it through grep -E "bash|ksh|zsh" . If that is not specific enough, try to anchor the patterns, or extend them by meaningful items.