Bash Script - Increment a variable

[spbr]

Hi,

I'm trying to increment the following code to line 2 on file2.log, as I would like it to automatically print each line from file1.log, one at a time:

#!/bin/bash
let "LINE++"
( head -1 file2.log
  head -${LINE} file1.log | tail -1
  tail --lines=+2 file2.log
) > file2.new

mv file2.log file2.old
mv file2.new file2.log

How could this be done?

Thank you

[Fetzie]

So you just want to take the text from the file, line by line, and append this to a log file?

[spbr]

2 minutes ago, Fetzie said:

So you just want to display the text from the file, line by line?

No, I want to print it into a file onto a specific line. 

[Fetzie]

2 minutes ago, spbr said:

No, I want to print it into a file onto a specific line. 

Does the file already exist, and, if so, does it already contain data?

[spbr]

1 minute ago, Fetzie said:

Does the file already exist, and, if so, does it already contain data?

correct

[Fetzie]

3 minutes ago, spbr said:

correct

Do you want to replace the contents of that line, or append the data to the end of the line?

[spbr]

18 minutes ago, Fetzie said:

Do you want to replace the contents of that line, or append the data to the end of the line?

So within the file I would like to keep:

wireless-key s: 

and only replace the password everytime through the loop

[Fetzie]

22 minutes ago, spbr said:

So within the file I would like to keep:

wireless-key s: 

and only replace the password everytime through the loop

Try this:

 

Use a while loop, which increments $lineNumber each time, until

wc -l file.txt

is reached and then runs

 

sed -i "$lineNumber s/.*/wireless-key s: $lineContents/" targetFilePath

 

You won't learn as much if I give you something to copy-paste

 

 

[spbr]

34 minutes ago, Fetzie said:

Try this:

 

Use a while loop, which increments $lineNumber each time, until

 

wc -l file.txt

 

is reached and then runs

 

 

sed -i "$lineNumber s/.*/wireless-key s: $lineContents/" targetFilePath

 

 

You won't learn as much if I give you something to copy-paste

 

 

 

Thank you

[spbr]

2 hours ago, Fetzie said:

Try this:

 

Use a while loop, which increments $lineNumber each time, until

 

wc -l file.txt

 

is reached and then runs

 

 

sed -i "$lineNumber s/.*/wireless-key s: $lineContents/" targetFilePath

 

 

You won't learn as much if I give you something to copy-paste

 

 

 

Hi,

 

I'm unsure on what to put in between the while loop brackets:

 

#!/bin/bash
x=1

while [ $x -le ]
do
        (       head -1 file2.log
                head -${x} file1.log | tail -1
                tail --lines=+2 file2.log
        ) > file2.new
        x=$(( $x + 1  ))
        if ( wc -1 file1.log  )
        then
                sed -i "$x s/.*/wireless-key s: $file1.log/" /etc/network/interfaces
                break
        fi
done

mv file2.log file2.old
mv file2.new file2.log
 

[Fetzie]

Why not something like:

 

#!/bin/bash 

sourceFile="/path/to/source/file"
targetFile="/etc/network/interfaces"
numLines=$(wc -l ${sourceFile})
counter=0

# exit if file is empty or does not exist, exit
if (( counter >= ${numLines} || ! -f ${sourceFile} )); then
	echo "invalid file"
    exit 0
fi   

while [ ${counter} -le ${numLines} ]; do

	sed -i "${lineNumber} s/.*/wireless-key s: $(sed -n ${counter}p <<< "${sourceFile}")/" "${targetFile}"
	counter=$((counter + 1))

done

 

 

Haven't run it but it should work. Might need bit bit of tweaking to get exactly what you want.

 

[spbr]

25 minutes ago, Fetzie said:

Why not something like:

 

#!/bin/bash 

sourceFile="/path/to/source/file"
targetFile="/etc/network/interfaces"
numLines=$(wc -l ${sourceFile})
counter=0

# exit if file is empty or does not exist, exit
if (( counter >= ${numLines} || ! -f ${sourceFile} )); then
	echo "invalid file"
    exit 0
fi   

while [ ${counter} -le ${numLines} ]; do

	sed -i "${lineNumber} s/.*/wireless-key s: $(sed -n ${counter}p <<< "${sourceFile}")/" "${targetFile}"
	counter=$((counter + 1))

done

 

 

Haven't run it but it should work. Might need bit bit of tweaking to get exactly what you want.

 

 

Thank you

[spbr]

On 2/18/2017 at 3:25 PM, Fetzie said:

Huge Thank you on the below

On 2/18/2017 at 3:25 PM, Fetzie said:

 

#!/bin/bash 

sourceFile="/path/to/source/file"
targetFile="/etc/network/interfaces"
numLines=$(wc -l ${sourceFile})
counter=0

# exit if file is empty or does not exist, exit
if (( counter >= ${numLines} || ! -f ${sourceFile} )); then
	echo "invalid file"
    exit 0
fi   

while [ ${counter} -le ${numLines} ]; do

	sed -i "${lineNumber} s/.*/wireless-key s: $(sed -n ${counter}p <<< "${sourceFile}")/" "${targetFile}"
	counter=$((counter + 1))

done

 

 

Haven't run it but it should work. Might need bit bit of tweaking to get exactly what you want.

 

1

 

Haven't run it but it should work. Might need bit bit of tweaking to get exactly what you want.

 

1

Unfortunately im at an inpass with the below:

sed -i "${lineNumber} s/.*/wireless-key s:" "$(sed -e ${counter}"p <<< "${sourceFile}")" ${targetFile}"

I'm unable to get this line correct so there is no errors, but when there isn't the target file doesn't print the contents of file1.log.

 

Thank you

[sgzUk74r3T3BCGmRJ]

?

[spbr]

7 minutes ago, sgzUk74r3T3BCGmRJ said:

It's unclear to me what you're trying to accomplish. You may get better help by explaining exactly want rather than asking for help doing whatever it is you think is the correct way to solve the problem. It could be that you've settled on the incorrect tools for the task and so asking for help banging them together is a waste of everyone's time.

 

Ignoring all of this BASH nonsense for a moment, is it fair to say you have two files?

$ cat foofile
flim
flam
floom

$ cat barfile
bing
bang
bong

Is it also fair to say you want to combine them by inserting the content of `foofile` into `barfile` at some arbitrary line?

$ combine-at-line 2 foofile barfile
flim
bing
bang
bong
flam
floom

If not then please give some examples of your source data and the expected output. Based on the above assumption, what you're describing looks like a job for `cat` and a file descriptor or two.

 

Hi,

I've got a list of permutations in one file and the program will need to do the following in this order:

• Take one permutation
• print to /etc/network/interfaces file, on line 3, in front of 'wireless-key s:'
• restart the network
• ping the network 5 times
• - if successful save the file and print to a file or screen listing the password
• if not successful restart from the top 

Thank you

[sgzUk74r3T3BCGmRJ]

?