draw rhomb

a=$(b=$(($LINES/2));f() { for c in $(seq $b); do for i in $(seq $c);do echo x;done|xargs echo;done };paste <(f) <(f|tac|tr 'x' '-') <(f|tac|tr 'x' '-') <(f)|tr '\t' ' ');(cat <<<"$a"|tac;cat <<<"$a")|tr '-' ' '

By: knoppix5
2015-04-08 02:33:05

What Others Think

Ooh, that's pretty, but I need to sleep :-)
flatcap · 337 weeks and 4 days ago
You command looked quite simple to start with. Then I noticed a spare ) and realised how devious it was! My first attempt is a bit more linear (and slightly smaller) L=$((LINES/2)) function f() { for A in $(seq $L); do for B in $(seq $L); do [ $A -lt $B ] && C=' ' || C=x echo -n "$C " done echo done } X=$(f | tac; f) paste <(echo "$X") <(echo "$X" | rev) | sed 's/\t //' The function f draws the bottom-left quadrant. Then I use tac and rev to reflect my way to the others. It compresses down to: L=$((LINES/2));f(){ for A in $(seq $L);do for B in $(seq $L);do [ $A -lt $B ]&&C=' '||C=x;echo -n "$C ";done;echo;done };X=$(f|tac;f);paste <(echo "$X") <(echo "$X"|rev)|sed 's/\t //' That's 183 characters against your 210.
flatcap · 337 weeks and 4 days ago
This new version starts with the middle line: x (lots of space) x then repeatedly replaces with whitespace with x (less space) x S=$((LINES*2-3)) L=$(printf "x%${S}sx" "") function g() { for A in $(seq $((LINES/2))); do echo "$L" L=$(echo "$L" | sed 's/ \( \+\)/ x\1x /') done } g | tac g Compressed: 159 characters: S=$((LINES*2-3));L=$(printf "x%${S}sx" "");function g(){ for A in $(seq $((LINES/2))); do echo "$L";L=$(echo "$L" | sed 's/ \( \+\)/ x\1x /');done };g|tac;g
flatcap · 337 weeks and 4 days ago
My last attempt was: a=$(b=$(($LINES/2-1));f() { for c in $(seq $b); do for i in $(seq $c);do echo x;done|xargs echo;done };paste <(f) <(f|tac|tr 'x' '-') <(f|tac|tr 'x' '-') <(f)|tr '\t' ' ');(cat <<<"$a"|tac;cat <<<"$a")|tr '-' ' '|sed 's/x \| x/+/g' but, probably being too long, uploaded and copied back from web behaved distorted. Probes with sed 's/^\|$/x/g' in combination with variable string length failed. In command simile to echo {1..10..2} replacing '10' with variable i.e. $b is not possible, so archaic seq behaves better this way. @flatcap: Your "compressed: 159 characters long" command doesn't work for me (distorted output), but this another one "183 characters long" is fine.
knoppix5 · 337 weeks and 4 days ago
The important (but squashed) part of my command was 4 spaces in the sed: ... | sed 's/ \( \+\)/ x\1x /' sed space single-quote s slash space space space space backslash open-bracket space backslash plus backslash close-bracket slash space x backslash 1 x space slash single-quote My next command will be something to transliterate shell-commands into English. Try1: https://gist.github.com/flatcap/7e44ac26e150cd10511b Try2: https://gist.github.com/flatcap/d475cd45bcc5a5f126b7
flatcap · 337 weeks and 4 days ago
Ah. I can get your latest command to work, by making a couple of tweaks. In the paste, change the fourth clause from: <(f)|tr '\t' ' ') to <(f)|tr -d '\t') Then remove the final sed: |sed 's/x \| x/+/g' Leaving: a=$(b=$(($LINES/2-1));f() { for c in $(seq $b); do for i in $(seq $c);do echo x;done|xargs echo;done };paste <(f) <(f|tac|tr 'x' '-') <(f|tac|tr 'x' '-') <(f)|tr -d '\t');(cat <<<"$a"|tac;cat <<<"$a")|tr '-' ' '
flatcap · 337 weeks and 4 days ago
I see. While copy-paste process web to terminal and vice versa sed is loosing spaces - cause your/mine last command didn't obey.
knoppix5 · 337 weeks and 4 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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