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:

 
#!/bin/bash
ls  -l > cust1
ls -x >> cust1
 
echo "The script has been run"
 
wc -l cust1 >> cust1
 
echo "The total number of words has been added to the file"
 
 

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.

[ghostdog74]

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:

 
#!/bin/bash
ls  -l > cust1
ls -x >> cust1
 
echo "The script has been run"
 
wc -l cust1 >> cust1
 
echo "The total number of words has been added to the file"
 
 

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,>>

[keyvanrahmadi]

this seems like homework. hint: you can use cat,split,>>

it is and its driving me insane, but so far i have achieved this:

 
#!/bin/bash
 
rm -Rf $1
ls -l > cust1
 
echo "script done"
 
cp cust1 temp.file
 
echo "Following infor blah blah" > temp2.file
 
 
cat temp2.file >> temp.file
 
cat temp.file >> cust1
 
rm temp2.file
 
rm temp.file
 
cat cust1
 
 
 

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

[ghostdog74]

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

# echo "thestringtoputontop" > temp
# cat thefile >> temp
# mv temp thefile
 

to put the string in middle with sed/awk. here's a crude way.

# linecount=$(wc -l file)
# echo ${linecount%file}
6
# half=$(echo "${linecount%file}/2" | bc) #this will divide your file into half
# echo $half
3
# echo "string" > temp
# split -l $half file #this will produce files xaa,xab
# cat temp >> xaa
# cat xab >> xaa
# mv xaa file
 

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