Shell Programming and Scripting

awk '{ for (i = 1; i <= 20; i++)  { starts=2500*$i-1; ends=2500*$i; NR>=starts && NR<=ends {f=My$i".txt"; print >> f; close(f)}  } }' main_file

awk: syntax error at source line 1
 context is
    { for (i = 1; i <= 20; i++)  { starts=2500*$i-1; ends=2500*$i; NR>=starts && NR<=ends >>>  { <<< 
awk: illegal statement at source line 1
awk: illegal statement at source line 1

 awk '!(NR%2500){i++;}{print > "f"i;}' i=1 file

man split

# If NR is a multiple of 2500, increment i.
!(NR%2500){i++;}
# Print into fi.
{print > "f"i;}

awk '!(NR%2500){i++;}{print > "f"i;}' i=1 file

 context is
    !(NR%2500){i++;}{print > >>>  "f"i <<< ;}
awk: illegal statement at source line 1

awk '!(NR%2500){close(f); f="f" i++}{print>f}' i=1 file

awk '!(NR%2500){f="f" i++}{print>f}' i=1 main_file

awk: null file name in print or getline
 input record number 1, file main_file
 source line number 1