how to append a block of statements after another block in the file
Hi
I need to append the following block of statements in the middle of the file: #
openpipe tsdbdwn2
set -x
exec >> /tmp/tsdbdwn2.fifo 2>&1
#
This needs to be appended right after another block of statements: if test $# -eq 0 ;then
echo "Safety check - do you really wish to run" $0 " on " `hostname` "?"
read safety
case $safety in
y|yes|Y|YES|Yes ) ;;
* ) echo $0: aborting ; exit 1 ;;
esac
fi
Is there an awk/sed commands which will allow me to do that, since I heed to update multiple files. Thanks a lot for any help.
How to insert a block of statements within a set of files
The smart answer is "no there is no easy way to do this. Edit the files yourself".
However, I took it as a challenge and came up with a solution, such as it is.
It will insert the new code multiple times, if necessary.
It's possible to get the wrong result if there is a lot of duplicate code in the file
and the lines follow each other with no breaks of any kind.
This is unlikely.
First, you need a file with the lines you want to insert .
newcode file:
#
Code:
openpipe tsdbdwn2
set -x
exec >> /tmp/tsdbdwn2.fifo 2>&1
#
You need a file containing the block of code which needs to be followed by the new code .
codepattern file:
Code:
if test $# -eq 0 ;then
echo "Safety check - do you really wish to run" $0 " on " `hostname` "?"
read safety
case $safety in
y|yes|Y|YES|Yes ) ;;
* ) echo $0: aborting ; exit 1 ;;
esac
fi
And you need this script which finds sequences of matches against the code patterns
and generates sed commands to insert the new code wherever it is needed.
Code:
#!/bin/sh
case "$1" in "" )
echo usage : $0 newcode_file existingblock_file inputfile... 1>&2
exit 0
;;
esac
newcodefile=$1
patternfile=$2
shift
shift
patternlines=`cat $patternfile | wc -l`
patternlines=`echo $patternlines`
for infile in "$@"
do
# get list of matches for patterns, with line numbers
fgrep -n -f $patternfile $infile | \
nawk -F: -v seqlen=$patternlines '
#{ print "last=" last " seq=" seq " f1=" $1 " " $2 ;}
last == "" { last = $1 ; next } # initialize
{
# check for match with sequential line number
if ($1 == (last + 1) ) {
# sequential match; check length of sequence
if (++seq == seqlen) {
# "add after " $1 " : " $0;
print $1 # print line number of
# end of code block matched
}
} else {
# not sequential any more - start over
seq = 1 # first match in sequence
}
}
{ last = $1}
' - | (
echo sed -e \'\' '\c'
while read line
do
# output sed command to read new code into file
echo "-e '${line}r $newcodefile' \c"
done
echo "$infile > $infile.new"
)
done
The output is a set of sed commands, which you can put in a file as a script,
or just pipe to "sh -x " to see them run.
Code:
$ ./insertcode
usage : ./insertcode newcode_file existingblock_file inputfile...
$ ./insertcode newcode codepattern f1 f2 f3
sed -e '' -e '20r newcode' f1 > f1.new
sed -e '' -e '19r newcode' f2 > f2.new
sed -e '' -e '20r newcode' -e '30r newcode' -e '49r newcode' f3 > f3.new
Code:
$ sed -e '' -e '20r newcode' f1 > f1.new
$ diff f1 f1.new
20a21,25
> #
> openpipe tsdbdwn2
> set -x
> exec >> /tmp/tsdbdwn2.fifo 2>&1
> #
i'll present my solution, too, but just cause it's an interesting paradigm
that can be modified to do almost anything.
Code:
for file in `cat my_list_of_files_to_edit` ; do
vi +/"Safety check - do you really wish to run" $file << EOF
:/^fi
O#
openpipe tsdbdwn2
set -x
exec >> /tmp/tsdbdwn2.fifo 2>&1
#
^[:wq
EOF
done
i'll present my solution, too, but just cause it's an interesting paradigm
that can be modified to do almost anything.
Indeed - I like this a lot.
This is an excellent approach if the files to be edited have a unique and easily found
insertion point and it is safe to stuff in the change.
I need to search for a block with the starting pattern say
"tabId": "table_1", and ending pattern say "]"
and then add a few lines before "]"
"block1":"block_111"
"tabId": "table_1",
"title":"My title"
.....
....
}]
how do I achieve it using awk and sed.
Thanks,
Lakshmi (3 Replies)
I have a file say "SAMPLE.txt" with following content,
P1
10,9:6/123456
P2
blah blah
P1
10,9:5/98765
P2
blah
blah
P1
blah blah
P2
I want a output file say "RESULT.txt" as,
Value1:123456
Value2:98765
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#!/bin/ksh
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Hei buddies,
Need ur help once again.
I have a file which has bunch of lines which starts from a fixed pattern and ends with another fixed pattern.
I want to make use of these fixed starting and ending patterns to select the bunch, one at a time.
The input file is as follows.
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Hi,
I need to convert the following file into DB insert statements.
$ cat input.txt
START
name=john
id=123
date=12/1/09
END
START
name=sam
id=4234
status=resigned
date=12/1/08
END (2 Replies)
