Do math arithmetic on busybox sh

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0
down vote

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I have string variables MIN and SEC (minute and seconds):



MIN="1"
SEC="34"


I want to do calculations on these:



TOTSEC = MIN*60 + SEC


I tried:



expr $SEC + $MIN * 60


Result:



expr: non-numeric argument


Let it be known I am running busybox on a custom microcomputer and so have no access to bash, bc, and that other solution provides.




shell busybox




share|improve this question






















  • You probably just need to escape the * i.e. expr $SEC + $MIN * 60
    – steeldriver
    Mar 23 at 2:12














up vote
0
down vote

favorite












I have string variables MIN and SEC (minute and seconds):



MIN="1"
SEC="34"


I want to do calculations on these:



TOTSEC = MIN*60 + SEC


I tried:



expr $SEC + $MIN * 60


Result:



expr: non-numeric argument


Let it be known I am running busybox on a custom microcomputer and so have no access to bash, bc, and that other solution provides.




shell busybox




share|improve this question






















  • You probably just need to escape the * i.e. expr $SEC + $MIN * 60
    – steeldriver
    Mar 23 at 2:12












up vote
0
down vote

favorite









up vote
0
down vote

favorite











I have string variables MIN and SEC (minute and seconds):



MIN="1"
SEC="34"


I want to do calculations on these:



TOTSEC = MIN*60 + SEC


I tried:



expr $SEC + $MIN * 60


Result:



expr: non-numeric argument


Let it be known I am running busybox on a custom microcomputer and so have no access to bash, bc, and that other solution provides.




shell busybox




share|improve this question














I have string variables MIN and SEC (minute and seconds):



MIN="1"
SEC="34"


I want to do calculations on these:



TOTSEC = MIN*60 + SEC


I tried:



expr $SEC + $MIN * 60


Result:



expr: non-numeric argument


Let it be known I am running busybox on a custom microcomputer and so have no access to bash, bc, and that other solution provides.





shell busybox





share|improve this question













share|improve this question




share|improve this question








edited Mar 23 at 2:09









cuonglm

97.2k21185278




97.2k21185278










asked Mar 23 at 1:57









GeneCode

658




658











  • You probably just need to escape the * i.e. expr $SEC + $MIN * 60
    – steeldriver
    Mar 23 at 2:12
















  • You probably just need to escape the * i.e. expr $SEC + $MIN * 60
    – steeldriver
    Mar 23 at 2:12















You probably just need to escape the * i.e. expr $SEC + $MIN * 60
– steeldriver
Mar 23 at 2:12




You probably just need to escape the * i.e. expr $SEC + $MIN * 60
– steeldriver
Mar 23 at 2:12










1 Answer
1






active

oldest

votes

















up vote
5
down vote













busybox uses ash, so you can use:



MIN=1 SEC=34 busybox sh -c 'echo "$(( MIN*60 + SEC ))"'
94


Or with expr:



MIN=1 SEC=34 busybox sh -c 'expr " $MIN" * 60 + "$SEC"'
94





share|improve this answer




















  • Appreciate your answer. But I ended up using awk. TOTSEC=`awk "BEGIN print $SEC+($MIN*60)"`
    – GeneCode
    Mar 23 at 2:50











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1 Answer
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active

oldest

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1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes








up vote
5
down vote













busybox uses ash, so you can use:



MIN=1 SEC=34 busybox sh -c 'echo "$(( MIN*60 + SEC ))"'
94


Or with expr:



MIN=1 SEC=34 busybox sh -c 'expr " $MIN" * 60 + "$SEC"'
94





share|improve this answer




















  • Appreciate your answer. But I ended up using awk. TOTSEC=`awk "BEGIN print $SEC+($MIN*60)"`
    – GeneCode
    Mar 23 at 2:50















up vote
5
down vote













busybox uses ash, so you can use:



MIN=1 SEC=34 busybox sh -c 'echo "$(( MIN*60 + SEC ))"'
94


Or with expr:



MIN=1 SEC=34 busybox sh -c 'expr " $MIN" * 60 + "$SEC"'
94





share|improve this answer




















  • Appreciate your answer. But I ended up using awk. TOTSEC=`awk "BEGIN print $SEC+($MIN*60)"`
    – GeneCode
    Mar 23 at 2:50













up vote
5
down vote










up vote
5
down vote









busybox uses ash, so you can use:



MIN=1 SEC=34 busybox sh -c 'echo "$(( MIN*60 + SEC ))"'
94


Or with expr:



MIN=1 SEC=34 busybox sh -c 'expr " $MIN" * 60 + "$SEC"'
94





share|improve this answer












busybox uses ash, so you can use:



MIN=1 SEC=34 busybox sh -c 'echo "$(( MIN*60 + SEC ))"'
94


Or with expr:



MIN=1 SEC=34 busybox sh -c 'expr " $MIN" * 60 + "$SEC"'
94






share|improve this answer












share|improve this answer



share|improve this answer










answered Mar 23 at 2:12









cuonglm

97.2k21185278




97.2k21185278











  • Appreciate your answer. But I ended up using awk. TOTSEC=`awk "BEGIN print $SEC+($MIN*60)"`
    – GeneCode
    Mar 23 at 2:50

















  • Appreciate your answer. But I ended up using awk. TOTSEC=`awk "BEGIN print $SEC+($MIN*60)"`
    – GeneCode
    Mar 23 at 2:50
















Appreciate your answer. But I ended up using awk. TOTSEC=`awk "BEGIN print $SEC+($MIN*60)"`
– GeneCode
Mar 23 at 2:50





Appreciate your answer. But I ended up using awk. TOTSEC=`awk "BEGIN print $SEC+($MIN*60)"`
– GeneCode
Mar 23 at 2:50













 

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