How would one go about using sed in order to insert
rm -rf
at the start of each line of a file?
sed 's/^/rm -rf /' filename
EDIT
Xargs would be simpler way to delete all of the files listed in another file
xargs -a filename rm -rf
Sometimes you have to go with the original method using sed, especially when you want to do things like
csf -d ipaddr.
xargs doesn't seem to like the output created by some commands and gives up after the first line. ie:
sed 's/^/csf -d /' hacks >>hacks.sh
Related
I am trying to find a particular string in files on my server. I have done the following which gives me a list of files, but how do I now delete them?
grep -H -r "example" /home/72754/domains | cut -d: -f1
Try this if you want to delete files:
grep -l -r "example" /home/72754/domains | xargs rm
You can use sed with the same pattern and change what you want
If you want to delete the whole line then something like this
sed '/example/d' /home/72754/domains
And to update the same file, use the -i flag
If you want to update a certain pattern, you can use something like this
sed 's/password/****/' /file
And again you can use the -i flag to update and overwrite the file
I'm trying to get rid of a hacker issue on some of my wordpress installs.
This guy puts 9 lines of code in the head of multiple files on my server... I'm trying to use grep and sed to solve this.
Im trying:
grep -r -l "//360cdn.win/c.css" | xargs -0 sed -e '1,9d' < {}
But nothing is happening, if I remove -0 fromxargs, the result of the files found are clean, but they are not overwriting the origin file with thesed` result, can anyone help me with that?
Many thanks!
You should use --null option in grep command to output a NUL byte or \0 after each filename in the grep output. Also use -i.bak in sed for inline editing of each file:
grep -lR --null '//360cdn.win/c\.css' . | xargs -0 sed -i.bak '1,9d'
What's wrong with iterating over the files directly¹?
And you might want to add the -i flat to sed so that files are edited in-place
grep -r -l "//360cdn.win/c.css" | while read f
do
sed -e '1,9d' -i "${f}"
done
¹ well, you might get problems if your files contain newlines and the like.
but then...if your website contains files with newlines, you probably have other problems anyhow...
Is it possible to search in a file using shell and then replace a value? When I install a service I would like to be able to search out a variable in a config file and then replace/insert my own settings in that value.
Sure, you can do this using sed or awk. sed example:
sed -i 's/Andrew/James/g' /home/oleksandr/names.txt
You can use sed to perform search/replace. I usually do this from a bash shell script, and move the original file containing values to be substituted to a new name, and run sed writing the output to my original file name like this:
#!/bin/bash
mv myfile.txt myfile.txt.in
sed -e 's/PatternToBeReplaced/Replacement/g' myfile.txt.in > myfile.txt.
If you don't specify an output, the replacement will go to stdout.
sed -i 's/variable/replacement/g' *.conf
You can use sed to do this:
sed -i 's/toreplace/yoursetting/' configfile
sed is probably available on every unix like system out there. If you want to replace more than one occurence you can add a g to the s-command:
sed -i 's/toreplace/yoursetting/g' configfile
Be careful since this can completely destroy your configfile if you don't specify your toreplace-value correctly. sed also supports regular expressions in searching and replacing.
Look at the UNIX power tools awk, sed, grep and in-place edit of files with Perl.
filepath="/var/start/system/dir1"
searchstring="test"
replacestring="test01"
i=0;
for file in $(grep -l -R $searchstring $filepath)
do
cp $file $file.bak
sed -e "s/$searchstring/$replacestring/ig" $file > tempfile.tmp
mv tempfile.tmp $file
let i++;
echo "Modified: " $file
done
Generally a tool like awk or sed are used for this.
$ sed -i 's/ugly/beautiful/g' /home/bruno/old-friends/sue.txt
What is the sed command to delete empty lines in a file.
What is the command (sed command?) to delete empty files in a folder?
You have to 'd' which is used to delete.
Ex:
sed -i '/^$/d' test
-i - is used to affect the file.
^ - is a beginning of line
$ - is a end of line
d - delete if there is a empty line
I hope this will help you.
/^$/d should do it.
for example
sed -i -e "/^$/d" myfile.txt
if you want to do this to all the files in a folder:
sed -i -e "/^$/d" *
-i means "edit in place" without it, the file will be edited and sent to standard output. The original file will be unmodified.
sed -e 's/#.*//;/^\s*$/d' /etc/lvm/lvm.conf
I have a text file with a bunch of file paths such as -
web/index.erb
web/contact.erb
...
etc. I need to append before the
</head>
a line of code, to every single file, I'm trying to figure out how to do this without opening each file of course. I've heard sed, but I've never used it before..was hoping there would be a grep command maybe?
Thanks
xargs can be used to apply sed (or any other command) to each filename or argument in a list. So combining that with Rom1's answer gives:
xargs sed -i 's/<\/html>/myline\n<\/html>/g' < fileslist.txt
while read f ; do
sed -i '/<\/head>/i*iamthelineofcode*' "$f"
done <iamthefileoffiles.list
or
sed -i '/<\/head>/i*iamthelineofcode*' $(cat iamthefileoffiles.list)