Counting program fails in arithmetic test

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0
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having a little trouble with this rather basic script. This script works on Bash in my macbook pro, but not on my Linux Mint desktop, which also uses bash.

I can't figure out what's wrong with it.

I'm still getting an error from bash saying:

line 6: [: -lt: unary operator expected
line 16: [: -gt: unary operator expected

with this updated code:

#!/bin/bash
clear
counter=0

function countup 
while [ $counter -lt 500 ]
do
 ((counter++))
 echo $counter
 sleep 0.2
done
countdown


function countdown 
while [ $counter -gt 0 ]
do
 ((counter--))
 echo $counter
 sleep 0.2
done
countup


countup

edited 32 mins ago

Rui F Ribeiro

37.3k1374118

asked Apr 11 '15 at 16:19

CYQ00000A

2

add space after 0 => 0 ] and remove : in both functions
â€“Â Costas
Apr 11 '15 at 16:25

1

Take a look at: shellcheck.net
â€“Â Cyrus
Apr 11 '15 at 16:25

Shellcheck says it is all looking good, but I still get the error.
â€“Â CYQ00000A
Apr 11 '15 at 16:50

2

Works for me. Have you really posted the code you're running? Seems like $counter is empty in your real code (use "$counter").
â€“Â choroba
Apr 11 '15 at 16:53

add a commentÂ |Â

up vote
0
down vote

favorite

having a little trouble with this rather basic script. This script works on Bash in my macbook pro, but not on my Linux Mint desktop, which also uses bash.

I can't figure out what's wrong with it.

I'm still getting an error from bash saying:

line 6: [: -lt: unary operator expected
line 16: [: -gt: unary operator expected

with this updated code:

#!/bin/bash
clear
counter=0

function countup 
while [ $counter -lt 500 ]
do
 ((counter++))
 echo $counter
 sleep 0.2
done
countdown


function countdown 
while [ $counter -gt 0 ]
do
 ((counter--))
 echo $counter
 sleep 0.2
done
countup


countup

edited 32 mins ago

Rui F Ribeiro

37.3k1374118

asked Apr 11 '15 at 16:19

CYQ00000A

2

add space after 0 => 0 ] and remove : in both functions
â€“Â Costas
Apr 11 '15 at 16:25

1

Take a look at: shellcheck.net
â€“Â Cyrus
Apr 11 '15 at 16:25

Shellcheck says it is all looking good, but I still get the error.
â€“Â CYQ00000A
Apr 11 '15 at 16:50

2

Works for me. Have you really posted the code you're running? Seems like $counter is empty in your real code (use "$counter").
â€“Â choroba
Apr 11 '15 at 16:53

add a commentÂ |Â

up vote
0
down vote

favorite

having a little trouble with this rather basic script. This script works on Bash in my macbook pro, but not on my Linux Mint desktop, which also uses bash.

I can't figure out what's wrong with it.

I'm still getting an error from bash saying:

line 6: [: -lt: unary operator expected
line 16: [: -gt: unary operator expected

with this updated code:

#!/bin/bash
clear
counter=0

function countup 
while [ $counter -lt 500 ]
do
 ((counter++))
 echo $counter
 sleep 0.2
done
countdown


function countdown 
while [ $counter -gt 0 ]
do
 ((counter--))
 echo $counter
 sleep 0.2
done
countup


countup

edited 32 mins ago

Rui F Ribeiro

37.3k1374118

asked Apr 11 '15 at 16:19

CYQ00000A

having a little trouble with this rather basic script. This script works on Bash in my macbook pro, but not on my Linux Mint desktop, which also uses bash.

I can't figure out what's wrong with it.

I'm still getting an error from bash saying:

line 6: [: -lt: unary operator expected
line 16: [: -gt: unary operator expected

with this updated code:

#!/bin/bash
clear
counter=0

function countup 
while [ $counter -lt 500 ]
do
 ((counter++))
 echo $counter
 sleep 0.2
done
countdown


function countdown 
while [ $counter -gt 0 ]
do
 ((counter--))
 echo $counter
 sleep 0.2
done
countup


countup

bash shell shell-script

edited 32 mins ago

Rui F Ribeiro

37.3k1374118

asked Apr 11 '15 at 16:19

CYQ00000A

edited 32 mins ago

Rui F Ribeiro

37.3k1374118

asked Apr 11 '15 at 16:19

CYQ00000A

edited 32 mins ago

Rui F Ribeiro

37.3k1374118

edited 32 mins ago

Rui F Ribeiro

37.3k1374118

edited 32 mins ago

Rui F Ribeiro

37.3k1374118

asked Apr 11 '15 at 16:19

CYQ00000A

asked Apr 11 '15 at 16:19

CYQ00000A

asked Apr 11 '15 at 16:19

CYQ00000A

2

add space after 0 => 0 ] and remove : in both functions
â€“Â Costas
Apr 11 '15 at 16:25

1

Take a look at: shellcheck.net
â€“Â Cyrus
Apr 11 '15 at 16:25

Shellcheck says it is all looking good, but I still get the error.
â€“Â CYQ00000A
Apr 11 '15 at 16:50

2

Works for me. Have you really posted the code you're running? Seems like $counter is empty in your real code (use "$counter").
â€“Â choroba
Apr 11 '15 at 16:53

add a commentÂ |Â

2

add space after 0 => 0 ] and remove : in both functions
â€“Â Costas
Apr 11 '15 at 16:25

1

Take a look at: shellcheck.net
â€“Â Cyrus
Apr 11 '15 at 16:25

Shellcheck says it is all looking good, but I still get the error.
â€“Â CYQ00000A
Apr 11 '15 at 16:50

2

Works for me. Have you really posted the code you're running? Seems like $counter is empty in your real code (use "$counter").
â€“Â choroba
Apr 11 '15 at 16:53

add space after 0 => 0 ] and remove : in both functions
â€“Â Costas
Apr 11 '15 at 16:25

Take a look at: shellcheck.net
â€“Â Cyrus
Apr 11 '15 at 16:25

Shellcheck says it is all looking good, but I still get the error.
â€“Â CYQ00000A
Apr 11 '15 at 16:50

Works for me. Have you really posted the code you're running? Seems like $counter is empty in your real code (use "$counter").
â€“Â choroba
Apr 11 '15 at 16:53

add a commentÂ |Â

1 Answer
1

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up vote
0
down vote

Try this:

#!/bin/bash
clear
counter=0

function countup 
 while [[ $counter -lt 500 ]]; do
 ((counter++))
 echo $counter
 sleep 0.2
 done

 countdown


function countdown 
 while [[ $counter -gt 0 ]]; do
 ((counter--))
 echo $counter
 sleep 0.2
 done

 countup


countup

[[ ]] is a bit more robust to unvalued variables. But, this script does run. It seems that you typed it differently here than your machine. This also looks like it will count up and down forever, but that seems to be intentional.

answered Jun 25 '15 at 5:34

Will

1,451722

add a commentÂ |Â

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1 Answer
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1 Answer
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active

oldest

votes

up vote
0
down vote

Try this:

#!/bin/bash
clear
counter=0

function countup 
 while [[ $counter -lt 500 ]]; do
 ((counter++))
 echo $counter
 sleep 0.2
 done

 countdown


function countdown 
 while [[ $counter -gt 0 ]]; do
 ((counter--))
 echo $counter
 sleep 0.2
 done

 countup


countup

answered Jun 25 '15 at 5:34

Will

1,451722

add a commentÂ |Â

up vote
0
down vote

Try this:

#!/bin/bash
clear
counter=0

function countup 
 while [[ $counter -lt 500 ]]; do
 ((counter++))
 echo $counter
 sleep 0.2
 done

 countdown


function countdown 
 while [[ $counter -gt 0 ]]; do
 ((counter--))
 echo $counter
 sleep 0.2
 done

 countup


countup

answered Jun 25 '15 at 5:34

Will

1,451722

add a commentÂ |Â

up vote
0
down vote

Try this:

#!/bin/bash
clear
counter=0

function countup 
 while [[ $counter -lt 500 ]]; do
 ((counter++))
 echo $counter
 sleep 0.2
 done

 countdown


function countdown 
 while [[ $counter -gt 0 ]]; do
 ((counter--))
 echo $counter
 sleep 0.2
 done

 countup


countup

answered Jun 25 '15 at 5:34

Will

1,451722

Try this:

#!/bin/bash
clear
counter=0

function countup 
 while [[ $counter -lt 500 ]]; do
 ((counter++))
 echo $counter
 sleep 0.2
 done

 countdown


function countdown 
 while [[ $counter -gt 0 ]]; do
 ((counter--))
 echo $counter
 sleep 0.2
 done

 countup


countup

answered Jun 25 '15 at 5:34

Will

1,451722

answered Jun 25 '15 at 5:34

Will

1,451722

answered Jun 25 '15 at 5:34

Will

1,451722

answered Jun 25 '15 at 5:34

Will

1,451722

add a commentÂ |Â

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