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UNIX Questions

keyvanrahmadi
hiya guys, i am trying to learn unix and i am sort of stuck in couple of questions, which i was hoping to get some help on.

1- i have created a file using the follwoing script:

Expand|Select|Wrap|Line Numbers
  1.  
  2. #!/bin/bash
  3. ls  -l > cust1
  4. ls -x >> cust1
  5.  
  6. echo "The script has been run"
  7.  
  8. wc -l cust1 >> cust1
  9.  
  10. echo "The total number of words has been added to the file"
  11.  
  12.  
basically what i need to learn how to do is how can i append a text to begining, middle and end of the file.

eg: i would like to add : "Required information" to the start, midle and end of the file.

I have also been told i cant use SED or AWK.

Any help or pointer would be great.

thx in advance

Keyvan.
Apr 15 '07 #1
3 2898
ghostdog74
511 Expert 256MB
hiya guys, i am trying to learn unix and i am sort of stuck in couple of questions, which i was hoping to get some help on.

1- i have created a file using the follwoing script:

Expand|Select|Wrap|Line Numbers
  1.  
  2. #!/bin/bash
  3. ls  -l > cust1
  4. ls -x >> cust1
  5.  
  6. echo "The script has been run"
  7.  
  8. wc -l cust1 >> cust1
  9.  
  10. echo "The total number of words has been added to the file"
  11.  
  12.  
basically what i need to learn how to do is how can i append a text to begining, middle and end of the file.

eg: i would like to add : "Required information" to the start, midle and end of the file.

I have also been told i cant use SED or AWK.

Any help or pointer would be great.

thx in advance

Keyvan.
this seems like homework. hint: you can use cat,split,>>
Apr 15 '07 #2
this seems like homework. hint: you can use cat,split,>>
it is and its driving me insane, but so far i have achieved this:

Expand|Select|Wrap|Line Numbers
  1.  
  2. #!/bin/bash
  3.  
  4. rm -Rf $1
  5. ls -l > cust1
  6.  
  7. echo "script done"
  8.  
  9. cp cust1 temp.file
  10.  
  11. echo "Following infor blah blah" > temp2.file
  12.  
  13.  
  14. cat temp2.file >> temp.file
  15.  
  16. cat temp.file >> cust1
  17.  
  18. rm temp2.file
  19.  
  20. rm temp.file
  21.  
  22. cat cust1
  23.  
  24.  
  25.  
Problem is i need echo "Following infor blah blah" on top of the file and currently is appended at the bottom of the page. Any idea how can i do that?

Keyvan
Apr 16 '07 #3
ghostdog74
511 Expert 256MB
to put a string on top of file without sed/awk, you just make a temp file with the string inside. Then use the cat command to append to the file
Expand|Select|Wrap|Line Numbers
  1. # echo "thestringtoputontop" > temp
  2. # cat thefile >> temp
  3. # mv temp thefile
  4.  
to put the string in middle with sed/awk. here's a crude way.
Expand|Select|Wrap|Line Numbers
  1. # linecount=$(wc -l file)
  2. # echo ${linecount%file}
  3. 6
  4. # half=$(echo "${linecount%file}/2" | bc) #this will divide your file into half
  5. # echo $half
  6. 3
  7. # echo "string" > temp
  8. # split -l $half file #this will produce files xaa,xab
  9. # cat temp >> xaa
  10. # cat xab >> xaa
  11. # mv xaa file
  12.  
to put string at end of file, just use the >> operator, or the usual cat.

Of course there are other ways to do all these, but this is just a crude example
Apr 16 '07 #4

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