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##bash, sed and coreutils, 95 89 bytes

You can define a function like this

f(){ n=$[$1-2];yes \ |sed $[$2*n]q|tr -d \\n|fold -w$n|sed 's/^\|$/|/g;1!{$!b};s/ /-/g';} 

Or in a more readable format:

f() { n=$(($1-2)) # The next couple of lines create a rectangle of spaces # matching the desired size yes ' ' | head -n$(($2*n)) | tr -d '\n' | fold -w$n | # Add the pipes and dashes sed ' s/^\|$/|/g # Replace first and last character by a pipe 1! {$!b } # Do nothing if not on first or last line s/ /-/g # Add the dashes ' echo } 

You can now say f 4 3:

|--| | | |--| 

If you care about trailing new-line, add an echo at the end of function.

bash, sed and coreutils, 95 89 bytes

You can define a function like this

f(){ n=$[$1-2];yes \ |sed $[$2*n]q|tr -d \\n|fold -w$n|sed 's/^\|$/|/g;1!{$!b};s/ /-/g';} 

Or in a more readable format:

f() { n=$(($1-2)) # The next couple of lines create a rectangle of spaces # matching the desired size yes ' ' | head -n$(($2*n)) | tr -d '\n' | fold -w$n | # Add the pipes and dashes sed ' s/^\|$/|/g # Replace first and last character by a pipe 1! {$!b } # Do nothing if not on first or last line s/ /-/g # Add the dashes ' echo } 

You can now say f 4 3:

|--| | | |--| 

If you care about trailing new-line, add an echo at the end of function.

##bash and coreutils, 95 bytes

You can define a function like this

f(){ n=$(($1-2));yes \ |head -n$(($2*n))|tr -d \\n|fold -w$n|sed 's/^\|$/|/g;1!{$!b};s/ /-/g';} 

Or in a more readable format:

f() { n=$(($1-2)) # The next couple of lines create a rectangle of spaces # matching the desired size yes ' ' | head -n$(($2*n)) | tr -d '\n' | fold -w$n | # Add the pipes and dashes sed ' s/^\|$/|/g # Replace first and last character by a pipe 1! {$!b } # Do nothing if not on first or last line s/ /-/g # Add the dashes ' echo } 

You can now say f 4 3:

|--| | | |--| 

If you care about trailing new-line, add an echo at the end of function.

##bash, sed and coreutils, 95 89 bytes

You can define a function like this

f(){ n=$[$1-2];yes \ |sed $[$2*n]q|tr -d \\n|fold -w$n|sed 's/^\|$/|/g;1!{$!b};s/ /-/g';} 

Or in a more readable format:

f() { n=$(($1-2)) # The next couple of lines create a rectangle of spaces # matching the desired size yes ' ' | head -n$(($2*n)) | tr -d '\n' | fold -w$n | # Add the pipes and dashes sed ' s/^\|$/|/g # Replace first and last character by a pipe 1! {$!b } # Do nothing if not on first or last line s/ /-/g # Add the dashes ' echo } 

You can now say f 4 3:

|--| | | |--| 

If you care about trailing new-line, add an echo at the end of function.

##bash and coreutils, 95 bytes

You can define a function like this

f(){ n=$(($1-2));yes \ |head -n$(($2*n))|tr -d \\n|fold -w$n|sed 's/^\|$/|/g;1!{$!b};s/ /-/g';} 

You can now say f 4 3:

|--| | | |--| 

If you care about trailing new-line, add an echo at the end of function.

##bash and coreutils, 95 bytes

You can define a function like this

f(){ n=$(($1-2));yes \ |head -n$(($2*n))|tr -d \\n|fold -w$n|sed 's/^\|$/|/g;1!{$!b};s/ /-/g';} 

Or in a more readable format:

f() { n=$(($1-2)) # The next couple of lines create a rectangle of spaces # matching the desired size yes ' ' | head -n$(($2*n)) | tr -d '\n' | fold -w$n | # Add the pipes and dashes sed ' s/^\|$/|/g # Replace first and last character by a pipe 1! {$!b } # Do nothing if not on first or last line s/ /-/g # Add the dashes ' echo } 

You can now say f 4 3:

|--| | | |--| 

If you care about trailing new-line, add an echo at the end of function.