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Sep 23rd, 2009
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find a paragraph in a file then delete it

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Hi Guys,

I have a file with lots of similar records example shown at end, I want to be able to delete one of the records and have the following line of code which finds the record I need to delete, my question is now I have found the record how do I delete it and keep the rest of the file intact.
Shell Scripting Syntax (Toggle Plain Text)
  1. awk '{ FS="\n" ; RS="define" } /STRING/ { print }' FILENAME
  2. e.g.
  3. awk '{ FS="\n" ; RS="define" } /check_chris/ { print }' xeno.cfg
File
Shell Scripting Syntax (Toggle Plain Text)
  1. define service{
  2. notification_interval           30
  3. check_period                    24x7
  4. notification_options c
  5. contact_groups                  unix
  6. use generic-service
  7. host_name xeno
  8. service_description Check dmesg for fails
  9. check_command check_nrpe!check_dmesg
  10. }
  11. define service{
  12. notification_interval           30
  13. check_period                    24x7
  14. notification_options c
  15. contact_groups                  unix
  16. use generic-service
  17. host_name xeno
  18. service_description Check Prtdiag
  19. check_command check_nrpe!check_prtdiag
  20. }
  21. define service{
  22. notification_interval           30
  23. check_period                    24x7
  24. notification_options c
  25. contact_groups                  unix
  26. use generic-service
  27. host_name xeno
  28. service_description Client Version
  29. check_command check_nrpe!check_uname
  30. }
  31. define service{
  32. notification_interval           30
  33. check_period                    24x7
  34. notification_options c
  35. notification_options c
  36. contact_groups                  unix
  37. use generic-service
  38. host_name xeno
  39. service_description DNS
  40. check_command check_nrpe!check_dns
  41. }
  42. define service{
  43. notification_interval           30
  44. check_period                    24x7
  45. notification_options c
  46. contact_groups                  unix
  47. use generic-service
  48. host_name xeno
  49. service_description Check NTP
  50. check_command check_nrpe!check_ntp
  51. }
  52. define service{
  53. notification_interval           30
  54. check_period                    24x7
  55. use generic-service
  56. host_name xeno
  57. service_description Check Memory
  58. check_command check_nrpe!check_mem
  59. notification_options n
  60. contact_groups unix
  61. }
  62. define service{
  63. notification_interval           30
  64. check_period                    24x7
  65. use generic-service
  66. host_name xeno
  67. service_description Check Swap
  68. check_command check_nrpe!check_swap
  69. notification_options n
  70. contact_groups unix
  71. }
  72. define service{
  73. notification_interval           30
  74. check_period                    24x7
  75. use generic-service
  76. host_name xeno
  77. service_description Load
  78. check_command check_nrpe!check_load
  79. notification_options n
  80. contact_groups unix
  81. }
  82. define service{
  83. notification_interval           30
  84. check_period                    24x7
  85. use generic-service
  86. host_name xeno
  87. service_description CPU
  88. check_command check_nrpe!check_cpu
  89. notification_options n
  90. contact_groups unix
  91. }
  92. define service{
  93. notification_interval           30
  94. check_period                    24x7
  95. use generic-service
  96. host_name xeno
  97. service_description Check IO Wait
  98. check_command check_nrpe!check_vmio
  99. notification_options n
  100. contact_groups unix
  101. }
  102. define service{
  103. notification_interval           30
  104. check_period                    24x7
  105. use generic-service
  106. host_name xeno
  107. service_description Check IO Wait
  108. check_command check_nrpe!check_chris
  109. notification_options n
  110. contact_groups unix
  111. }
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Reputation Points: 38
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chris5126 is offline Offline
412 posts
since Feb 2006
Permalink
Sep 23rd, 2009
0

Re: find a paragraph in a file then delete it

Invert the match:
Shell Scripting Syntax (Toggle Plain Text)
  1. awk '{ FS="\n" ; RS="define" } $RS !~ /check_chris/ { print }' file
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sknake is offline Offline
3,948 posts
since Feb 2009
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Sep 24th, 2009
0

Re: find a paragraph in a file then delete it

hi,

That also removes the word define from every other serivce e.g:

before
Shell Scripting Syntax (Toggle Plain Text)
  1. define service{
  2. notification_interval           30
  3. check_period                    24x7
  4. notification_options c
  5. contact_groups                  unix
  6.         use generic-service
  7.         host_name xeno
  8.         service_description Current Users
  9.         check_command check_nrpe!check_users
  10. }
After
Shell Scripting Syntax (Toggle Plain Text)
  1.  service{
  2. notification_interval           30
  3. check_period                    24x7
  4. notification_options c
  5. contact_groups                  unix
  6.         use generic-service
  7.         host_name xeno
  8.         service_description Check Root Volume
  9.         check_command check_nrpe!check_root
  10. }
  11.  
  12.  service{
  13. notification_interval           30
  14. check_period                    24x7
  15. notification_options c
  16. contact_groups                  unix
  17.         use generic-service
  18.         host_name xeno
  19.         service_description Check Var Volume
  20.         check_command check_nrpe!check_var
  21. }
  22. etc etc
Anyway to stop this happening.
Reputation Points: 38
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chris5126 is offline Offline
412 posts
since Feb 2006
Permalink
Sep 24th, 2009
0

Re: find a paragraph in a file then delete it

Just stick it back in:
Shell Scripting Syntax (Toggle Plain Text)
  1. awk '{ FS="\n" ; RS="define" } $RS !~ /check_chris/ { print "define" $RS }' file
Featured Poster
Reputation Points: 1749
Solved Threads: 735
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sknake is offline Offline
3,948 posts
since Feb 2009
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Sep 24th, 2009
0

Re: find a paragraph in a file then delete it

Cool one last thing! It didnt remove the record seperator for the first record so when I run the code you gave I get definedefine for the first record example below. Any help?:

Shell Scripting Syntax (Toggle Plain Text)
  1. definedefine service{
  2. definenotification_interval           30
  3. check_period                    24x7
  4. notification_options c
  5. contact_groups                  unix
  6.         use generic-service
  7.         host_name xeno
  8.         service_description Current Users
  9.         check_command check_nrpe!check_users
  10. }
  11.  
  12.  
  13. define service{
  14. notification_interval           30
  15. check_period                    24x7
  16. notification_options c
  17. contact_groups                  unix
  18.         use generic-service
  19.         host_name xeno
  20.         service_description Check Root Volume
  21.         check_command check_nrpe!check_root
  22. }
  23.  
  24.  
  25. define service{
  26. notification_interval           30
  27. check_period                    24x7
  28. notification_options c
  29. contact_groups                  unix
  30.         use generic-service
  31.         host_name xeno
  32.         service_description Check Var Volume
  33.         check_command check_nrpe!check_var
  34. }
Reputation Points: 38
Solved Threads: 15
Posting Pro in Training
chris5126 is offline Offline
412 posts
since Feb 2006
Permalink
Sep 24th, 2009
0

Re: find a paragraph in a file then delete it

I do a bad job at checking my work it seems. There are two problems:
definedefine service{
definenotification_interval           30

Awk is handling the first record differently and for this I don't have an answer. Its sticking the define down a row. I'm sure this is not the "proper" way but at this point I would do:
Shell Scripting Syntax (Toggle Plain Text)
  1. awk '{ RS="define" } $RS !~ /check_chris/ { print "define" $RS }' file | sed 's/definedefine service/define service/g' | sed 's/definenotification_interval/notification_interval/g' | less
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sknake is offline Offline
3,948 posts
since Feb 2009
Permalink
Sep 24th, 2009
0

Re: find a paragraph in a file then delete it

nice bit of a hack but seems to work ta very much! only fault is it adds two new lines after every service but I will strip those out with sed!
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chris5126 is offline Offline
412 posts
since Feb 2006

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