How can I pass command-line arguments to a Perl program

Question

I m working on a Perl script  How can I pass command line parameters to it   Example   script pl  string1   string2

User · Answer

If you just want some values  you can just use the  ARGV array  But if you are looking for something more powerful in order to do some command line options processing  you should use Getopt  Long

User · Answer

foreach my  arg   ARGV        print  arg    n       will print each argument

User · Answer

You can access them directly  by assigning the special variable  ARGV to a list of variables  So  for example      st   prod   ar   file   chart   e   max   flag   id     ARGV    perl tmp pl 1 2 3 4 5

User · Answer

If the arguments are filenames to be read from  use the diamond   lt    operator to get at their contents   while  my  line    lt  gt       process line  line       If the arguments are options switches  use GetOpt  Std or GetOpt  Long  as already shown by slavy13 myopenid com   On the off chance that they re something else  you can access them either by walking through  ARGV explicitly or with the shift command   while  my  arg   shift      print  Found argument  arg n        Note that doing this with shift will only work if you are outside of all subs   Within a sub  it will retrieve the list of arguments passed to the sub rather than those passed to the program

User · Answer

foreach my  arg   ARGV        print  arg    n       will print each argument

User · Answer

Depends on what you want to do  If you want to use the two arguments as input files  you can just pass them in and then use  lt  gt  to read their contents   If they have a different meaning  you can use GetOpt  Std and GetOpt  Long to process them easily  GetOpt  Std supports only single-character switches and GetOpt  Long is much more flexible  From GetOpt  Long    use Getopt  Long  my  data      file dat   my  length   24  my  verbose   result   GetOptions   length i    gt    length       numeric                      file s      gt    data         string                      verbose     gt    verbose      flag   Alternatively   ARGV is a special variable that contains all the command line arguments   ARGV 0  is the first  ie   string1  in your case  and  ARGV 1  is the second argument  You don t need a special module to access  ARGV

User · Answer

my  output file   if  scalar   ARGV     2   amp  amp    ARGV 0  eq  -i         output file  chomp  ARGV 1

User · Answer

Depends on what you want to do  If you want to use the two arguments as input files  you can just pass them in and then use  lt  gt  to read their contents   If they have a different meaning  you can use GetOpt  Std and GetOpt  Long to process them easily  GetOpt  Std supports only single-character switches and GetOpt  Long is much more flexible  From GetOpt  Long    use Getopt  Long  my  data      file dat   my  length   24  my  verbose   result   GetOptions   length i    gt    length       numeric                      file s      gt    data         string                      verbose     gt    verbose      flag   Alternatively   ARGV is a special variable that contains all the command line arguments   ARGV 0  is the first  ie   string1  in your case  and  ARGV 1  is the second argument  You don t need a special module to access  ARGV

User · Answer

If you just want some values  you can just use the  ARGV array  But if you are looking for something more powerful in order to do some command line options processing  you should use Getopt  Long

User · Answer

Yet another options is to use perl -s  eg      usr bin perl -s  print  value of -x   x n   print  value of -name   name n     Then call it like this        myprog -x -name Jeff value of -x  1 value of -name  Jeff   Or see the original article for more details

User · Answer

Alternatively  a sexier perlish way       my   src   dest     ARGV    Assumes  two values are passed  Extra code can verify the assumption is safe

User · Answer

foreach my  arg   ARGV        print  arg    n       will print each argument

User · Answer

If the arguments are filenames to be read from  use the diamond   lt    operator to get at their contents   while  my  line    lt  gt       process line  line       If the arguments are options switches  use GetOpt  Std or GetOpt  Long  as already shown by slavy13 myopenid com   On the off chance that they re something else  you can access them either by walking through  ARGV explicitly or with the shift command   while  my  arg   shift      print  Found argument  arg n        Note that doing this with shift will only work if you are outside of all subs   Within a sub  it will retrieve the list of arguments passed to the sub rather than those passed to the program

User · Answer

Depends on what you want to do  If you want to use the two arguments as input files  you can just pass them in and then use  lt  gt  to read their contents   If they have a different meaning  you can use GetOpt  Std and GetOpt  Long to process them easily  GetOpt  Std supports only single-character switches and GetOpt  Long is much more flexible  From GetOpt  Long    use Getopt  Long  my  data      file dat   my  length   24  my  verbose   result   GetOptions   length i    gt    length       numeric                      file s      gt    data         string                      verbose     gt    verbose      flag   Alternatively   ARGV is a special variable that contains all the command line arguments   ARGV 0  is the first  ie   string1  in your case  and  ARGV 1  is the second argument  You don t need a special module to access  ARGV

User · Answer

foreach my  arg   ARGV        print  arg    n       will print each argument

User · Answer

You pass them in just like you re thinking  and in your script  you get them from the array  ARGV   Like so   my  numArgs     ARGV   1  print  thanks  you gave me  numArgs command-line arguments  n    foreach my  argnum  0      ARGV        print   ARGV  argnum  n        From here

User · Answer

You pass them in just like you re thinking  and in your script  you get them from the array  ARGV   Like so   my  numArgs     ARGV   1  print  thanks  you gave me  numArgs command-line arguments  n    foreach my  argnum  0      ARGV        print   ARGV  argnum  n        From here

User · Answer

If you just want some values  you can just use the  ARGV array  But if you are looking for something more powerful in order to do some command line options processing  you should use Getopt  Long

User · Answer

Alternatively  a sexier perlish way       my   src   dest     ARGV    Assumes  two values are passed  Extra code can verify the assumption is safe

User · Answer

If you just want some values  you can just use the  ARGV array  But if you are looking for something more powerful in order to do some command line options processing  you should use Getopt  Long

User · Answer

You pass them in just like you re thinking  and in your script  you get them from the array  ARGV   Like so   my  numArgs     ARGV   1  print  thanks  you gave me  numArgs command-line arguments  n    foreach my  argnum  0      ARGV        print   ARGV  argnum  n        From here

User · Answer

You pass them in just like you re thinking  and in your script  you get them from the array  ARGV   Like so   my  numArgs     ARGV   1  print  thanks  you gave me  numArgs command-line arguments  n    foreach my  argnum  0      ARGV        print   ARGV  argnum  n        From here

User · Answer

Yet another options is to use perl -s  eg      usr bin perl -s  print  value of -x   x n   print  value of -name   name n     Then call it like this        myprog -x -name Jeff value of -x  1 value of -name  Jeff   Or see the original article for more details

User · Answer

If the arguments are filenames to be read from  use the diamond   lt    operator to get at their contents   while  my  line    lt  gt       process line  line       If the arguments are options switches  use GetOpt  Std or GetOpt  Long  as already shown by slavy13 myopenid com   On the off chance that they re something else  you can access them either by walking through  ARGV explicitly or with the shift command   while  my  arg   shift      print  Found argument  arg n        Note that doing this with shift will only work if you are outside of all subs   Within a sub  it will retrieve the list of arguments passed to the sub rather than those passed to the program

User · Answer

Depends on what you want to do  If you want to use the two arguments as input files  you can just pass them in and then use  lt  gt  to read their contents   If they have a different meaning  you can use GetOpt  Std and GetOpt  Long to process them easily  GetOpt  Std supports only single-character switches and GetOpt  Long is much more flexible  From GetOpt  Long    use Getopt  Long  my  data      file dat   my  length   24  my  verbose   result   GetOptions   length i    gt    length       numeric                      file s      gt    data         string                      verbose     gt    verbose      flag   Alternatively   ARGV is a special variable that contains all the command line arguments   ARGV 0  is the first  ie   string1  in your case  and  ARGV 1  is the second argument  You don t need a special module to access  ARGV

User · Answer

If the arguments are filenames to be read from  use the diamond   lt    operator to get at their contents   while  my  line    lt  gt       process line  line       If the arguments are options switches  use GetOpt  Std or GetOpt  Long  as already shown by slavy13 myopenid com   On the off chance that they re something else  you can access them either by walking through  ARGV explicitly or with the shift command   while  my  arg   shift      print  Found argument  arg n        Note that doing this with shift will only work if you are outside of all subs   Within a sub  it will retrieve the list of arguments passed to the sub rather than those passed to the program

User · Answer

You can access them directly  by assigning the special variable  ARGV to a list of variables  So  for example      st   prod   ar   file   chart   e   max   flag   id     ARGV    perl tmp pl 1 2 3 4 5

User · Answer

my  output file   if  scalar   ARGV     2   amp  amp    ARGV 0  eq  -i         output file  chomp  ARGV 1

[perl] How can I pass command-line arguments to a Perl program?

Examples related to perl

Examples related to command-line