Inserting lines at the start of a text file

[Bad Inferno]

I have a log file which I send a line of text to. I use the "echo sometext >> logfile" at the moment.

When I add a line to this text file I want to insert it and the new line to become the first line in the file not the last...Any thoughts Or can someone help with a bash script snippet that reads the contents of my file and writes it to a new file in reverse order ? Theres probably only ~100 lines of text in the file

Cheers

rob
Australia

[drl]

Hi.

In Linux, I see:

% man -k reverse
rev (1)              - reverse lines of a file
tac (1)              - concatenate and print files in reverse

Perhaps you can build upon these ... cheers, drl

[jozyba]

As drl says, you could use tac:

LOGFILE=/path/to/logfile
TEMP=/tmp/templogfile

tac $LOGFILE >$TEMP
echo "This is line One" >>$TEMP
tac $TEMP >$LOGFILE

Or you could do it this way:

LOGFILE=/path/to/logfile
TEMP=/tmp/templogfile

echo "This is line Uno" >$TEMP
cat $LOGFILE >>$TEMP
mv $TEMP $LOGFILE

[ghostdog74]

I have a log file which I send a line of text to. I use the "echo sometext >> logfile" at the moment.

When I add a line to this text file I want to insert it and the new line to become the first line in the file not the last...Any thoughts Or can someone help with a bash script snippet that reads the contents of my file and writes it to a new file in reverse order ? Theres probably only ~100 lines of text in the file

Cheers

rob
Australia

1)

echo "sometext" > sometext.txt
cat sometext.txt logfile > putfile

2)

sed -i '1i sometext' logfile