Prepare arguments containing quoted string in variable











up vote
3
down vote

favorite












In a Bash script, I call a program like this in several places:



numfmt --suffix=" B" --grouping 231210893


Where the number is different every time, but the other parameters stay the same.



I would now like to move the other parameters out of the many different calls, so they are centrally defined and can be easily changed. My attempt was like this:



NUMFMT='--suffix=" B" --grouping'

...

numfmt $NUMFMT 231210893


Unfortunately, this doesn't work. The quote signs are removed at some point, and numfmt complains about an uninterpretable extra argument B. I tried plenty of other versions, using other quotes both in the definition and in the use of NUMFMT, to no avail.



How do I do this properly? And if it's not too complicated, I would also like to understand why my version doesn't work and (hopefully) another one does.






bash string bash-expansion







share|improve this question




















  • 3




    See Why does my shell script choke on whitespace or other special characters? - in particular, the section How do I store a command in a variable? in @Gilles answer
    – steeldriver
    Nov 18 at 0:57















up vote
3
down vote

favorite












In a Bash script, I call a program like this in several places:



numfmt --suffix=" B" --grouping 231210893


Where the number is different every time, but the other parameters stay the same.



I would now like to move the other parameters out of the many different calls, so they are centrally defined and can be easily changed. My attempt was like this:



NUMFMT='--suffix=" B" --grouping'

...

numfmt $NUMFMT 231210893


Unfortunately, this doesn't work. The quote signs are removed at some point, and numfmt complains about an uninterpretable extra argument B. I tried plenty of other versions, using other quotes both in the definition and in the use of NUMFMT, to no avail.



How do I do this properly? And if it's not too complicated, I would also like to understand why my version doesn't work and (hopefully) another one does.






bash string bash-expansion







share|improve this question




















  • 3




    See Why does my shell script choke on whitespace or other special characters? - in particular, the section How do I store a command in a variable? in @Gilles answer
    – steeldriver
    Nov 18 at 0:57













up vote
3
down vote

favorite









up vote
3
down vote

favorite











In a Bash script, I call a program like this in several places:



numfmt --suffix=" B" --grouping 231210893


Where the number is different every time, but the other parameters stay the same.



I would now like to move the other parameters out of the many different calls, so they are centrally defined and can be easily changed. My attempt was like this:



NUMFMT='--suffix=" B" --grouping'

...

numfmt $NUMFMT 231210893


Unfortunately, this doesn't work. The quote signs are removed at some point, and numfmt complains about an uninterpretable extra argument B. I tried plenty of other versions, using other quotes both in the definition and in the use of NUMFMT, to no avail.



How do I do this properly? And if it's not too complicated, I would also like to understand why my version doesn't work and (hopefully) another one does.






bash string bash-expansion







share|improve this question















In a Bash script, I call a program like this in several places:



numfmt --suffix=" B" --grouping 231210893


Where the number is different every time, but the other parameters stay the same.



I would now like to move the other parameters out of the many different calls, so they are centrally defined and can be easily changed. My attempt was like this:



NUMFMT='--suffix=" B" --grouping'

...

numfmt $NUMFMT 231210893


Unfortunately, this doesn't work. The quote signs are removed at some point, and numfmt complains about an uninterpretable extra argument B. I tried plenty of other versions, using other quotes both in the definition and in the use of NUMFMT, to no avail.



How do I do this properly? And if it's not too complicated, I would also like to understand why my version doesn't work and (hopefully) another one does.






bash string bash-expansion




bash string bash-expansion






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 18 at 13:41









Peter Mortensen

85758




85758










asked Nov 18 at 0:42









A. Donda

1558




1558








  • 3




    See Why does my shell script choke on whitespace or other special characters? - in particular, the section How do I store a command in a variable? in @Gilles answer
    – steeldriver
    Nov 18 at 0:57














  • 3




    See Why does my shell script choke on whitespace or other special characters? - in particular, the section How do I store a command in a variable? in @Gilles answer
    – steeldriver
    Nov 18 at 0:57








3




3




See Why does my shell script choke on whitespace or other special characters? - in particular, the section How do I store a command in a variable? in @Gilles answer
– steeldriver
Nov 18 at 0:57




See Why does my shell script choke on whitespace or other special characters? - in particular, the section How do I store a command in a variable? in @Gilles answer
– steeldriver
Nov 18 at 0:57










2 Answers
2






active

oldest

votes

















up vote
6
down vote



accepted










Try arrays:



NUMFMT=( --suffix=" B"   '--grouping' )

....

numfmt "${NUMFMT[@]}" 231210893





share|improve this answer























  • I had to remove the "s in the first argument, but now it works perfectly. Thanks!
    – A. Donda
    Nov 18 at 1:38




















up vote
0
down vote













Wouldn't that be an excellent case for an alias?



$ alias nfmtB='numfmt --suffix=" B" --grouping'

$ nfmtB 324235345656

324.235.345.656 B





share|improve this answer





















  • Good idea but with a little catch: command aliases are disabled in scripts by default unless enabled with shopt -s expand_aliases.
    – David Foerster
    Nov 18 at 12:29













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2 Answers
2






active

oldest

votes








2 Answers
2






active

oldest

votes









active

oldest

votes






active

oldest

votes








up vote
6
down vote



accepted










Try arrays:



NUMFMT=( --suffix=" B"   '--grouping' )

....

numfmt "${NUMFMT[@]}" 231210893





share|improve this answer























  • I had to remove the "s in the first argument, but now it works perfectly. Thanks!
    – A. Donda
    Nov 18 at 1:38

















up vote
6
down vote



accepted










Try arrays:



NUMFMT=( --suffix=" B"   '--grouping' )

....

numfmt "${NUMFMT[@]}" 231210893





share|improve this answer























  • I had to remove the "s in the first argument, but now it works perfectly. Thanks!
    – A. Donda
    Nov 18 at 1:38















up vote
6
down vote



accepted







up vote
6
down vote



accepted






Try arrays:



NUMFMT=( --suffix=" B"   '--grouping' )

....

numfmt "${NUMFMT[@]}" 231210893





share|improve this answer














Try arrays:



NUMFMT=( --suffix=" B"   '--grouping' )

....

numfmt "${NUMFMT[@]}" 231210893






share|improve this answer














share|improve this answer



share|improve this answer








edited Nov 18 at 3:26









Filipe Brandenburger

6,6801732




6,6801732










answered Nov 18 at 1:21









Isaac

10.1k11445




10.1k11445












  • I had to remove the "s in the first argument, but now it works perfectly. Thanks!
    – A. Donda
    Nov 18 at 1:38




















  • I had to remove the "s in the first argument, but now it works perfectly. Thanks!
    – A. Donda
    Nov 18 at 1:38


















I had to remove the "s in the first argument, but now it works perfectly. Thanks!
– A. Donda
Nov 18 at 1:38






I had to remove the "s in the first argument, but now it works perfectly. Thanks!
– A. Donda
Nov 18 at 1:38














up vote
0
down vote













Wouldn't that be an excellent case for an alias?



$ alias nfmtB='numfmt --suffix=" B" --grouping'

$ nfmtB 324235345656

324.235.345.656 B





share|improve this answer





















  • Good idea but with a little catch: command aliases are disabled in scripts by default unless enabled with shopt -s expand_aliases.
    – David Foerster
    Nov 18 at 12:29

















up vote
0
down vote













Wouldn't that be an excellent case for an alias?



$ alias nfmtB='numfmt --suffix=" B" --grouping'

$ nfmtB 324235345656

324.235.345.656 B





share|improve this answer





















  • Good idea but with a little catch: command aliases are disabled in scripts by default unless enabled with shopt -s expand_aliases.
    – David Foerster
    Nov 18 at 12:29















up vote
0
down vote










up vote
0
down vote









Wouldn't that be an excellent case for an alias?



$ alias nfmtB='numfmt --suffix=" B" --grouping'

$ nfmtB 324235345656

324.235.345.656 B





share|improve this answer












Wouldn't that be an excellent case for an alias?



$ alias nfmtB='numfmt --suffix=" B" --grouping'

$ nfmtB 324235345656

324.235.345.656 B






share|improve this answer












share|improve this answer



share|improve this answer










answered Nov 18 at 11:52









RudiC

3,5171312




3,5171312












  • Good idea but with a little catch: command aliases are disabled in scripts by default unless enabled with shopt -s expand_aliases.
    – David Foerster
    Nov 18 at 12:29




















  • Good idea but with a little catch: command aliases are disabled in scripts by default unless enabled with shopt -s expand_aliases.
    – David Foerster
    Nov 18 at 12:29


















Good idea but with a little catch: command aliases are disabled in scripts by default unless enabled with shopt -s expand_aliases.
– David Foerster
Nov 18 at 12:29






Good idea but with a little catch: command aliases are disabled in scripts by default unless enabled with shopt -s expand_aliases.
– David Foerster
Nov 18 at 12:29




















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