Assigning system command’s output to variable

by

Note: Coprocess is GNU awk specific.
Anyway another alternative is using getline

cmd = "strip "$1
while ( ( cmd | getline result ) > 0 ) {
  print  result
} 
close(cmd)

Calling close(cmd) will prevent awk to throw this error after a number of calls :

fatal: cannot open pipe `…’ (Too many open files)

More Related Contents:

  1. How do you delete all lines that contain no letters from the alphabet using either grep, sed, or awk? [closed]
  2. substitute words on a line only before first delimeter using sed or awk
  3. Printing with sed or awk a line following a matching pattern
  4. What are NR and FNR and what does “NR==FNR” imply?
  5. How do I find the text that matches a pattern?
  6. Escaping separator within double quotes, in awk
  7. Is a /start/,/end/ range expression ever useful in awk?
  8. Can we use shell variables in awk?
  9. Summing values of a column using awk command
  10. Using multiple delimiters in awk
  11. Print all but the first three columns
  12. Using AWK to Process Input from Multiple Files
  13. Why does “1” in awk print the current line?
  14. How to split a delimited string into an array in awk?
  15. How to escape a single quote inside awk
  16. Random numbers generation with awk in BASH shell
  17. How to show only next line after the matched one?
  18. Print second-to-last column/field in `awk`
  19. How can I make awk not use scientific notation when printing small values?
  20. print unique lines based on field
  21. ignorecase in AWK
  22. Using awk to pull specific lines from a file
  23. get the user input in awk
  24. How to preserve the original whitespace between fields in awk?
  25. using awk with column value conditions
  26. Why no output is shown when using grep twice?
  27. How to add text at the end of each line in unix
  28. How can I read a child process’s output?
  29. How to print 5 consecutive lines after a pattern in file using awk [duplicate]
  30. How to remove blank lines from a Unix file

Leave a Comment