Which of the following commands accept the --preserve-root flag?
chgrp
chmod
rm
rsync
for cmd in chgrp chmod rm rsync; do
man "$cmd" | grep -q "preserve-root" && echo "$cmd"
done
OR
$ for i in chgrp chmod rm rsync; do $i --help | grep -q '\-\-preserve\-root' && echo $i; done
chgrp
chmod
rm
Related
Releases uploads every time to url like
https://github.com/ipfs/go-ipfs/releases/tag/v0.9.1
my script is
#!/bin/bash
rm /home/ipfs/go-ipfs -rf
rm go-ipfs.tar.gz
curl -s https://api.github.com/repos/ipfs/go-ipfs/releases/latest | grep linux-amd64.tar.gz\" | grep download | sed 's/.*: \"//g' | sed 's/\"//g' | wget -i - -O /home/ipfs/go-ipfs.tar.gz
if test -f /home/ipfs/go-ipfs.tar.gz then
tar -xf /home/ipfs/go-ipfs.tar.g
newsize=$(wc -c <"/home/ipfs/go-ipfs/ipfs")
cursize=$(wc -c <"/home/ipfs/ipfs")
if [$newsize -ne $cursize]; then
mv /home/ipfs/go-ipfs/ipfs /home/ipfs/ipfs
chmod +x /home/ipfs/ipfs
pkill ipfs
fi
fi
but it has an error i cant fix
Solution is
#!/bin/bash
#remove old repo folder
rm /home/ipfs/go-ipfs -rf
#remove old tar.gz
rm go-ipfs.tar.gz
#try to download new
curl -s https://api.github.com/repos/ipfs/go-ipfs/releases/latest | grep linux-amd64.tar.gz\" | grep download | sed 's/.*: \"//g' | sed 's/\"//g' | wget -i - -O /home/ipfs/go-ipfs.tar.gz
#check file exists
if [ -f /home/ipfs/go-ipfs.tar.gz ]; then
#unpack tar gz
tar -xf /home/ipfs/go-ipfs.tar.gz
#get file sizes
newsize=$(wc -c <"/home/ipfs/go-ipfs/ipfs")
cursize=$(wc -c <"/home/ipfs/ipfs")
#if new file is not as current
if (($newsize != $cursize)); then
#replace it
mv /home/ipfs/go-ipfs/ipfs /home/ipfs/ipfs
chmod +x /home/ipfs/ipfs
#kill old to restart new
pkill ipfs
fi
fi
I have 4 commands I want to run:
sudo mkdir -p /data/db && \
sudo chmod 755 /data/db && \
sudo chown -R addison.pan: /data && \
mongod &
I only want to run mongod in the background if the other 3 above it succeed. But when I type this into bash, it runs the whole thing as one background task. How do I only make the mongod run in the background, and only if it gets to it?
To run one or more commands in a separate process, enclose that series of commands in parentheses. As specified in the Single Unix Specification, §2.9.4 “Compound Commands”:
( compound-list )
Execute compound-list in a subshell environment […]
To group one or more commands in the same shell process, enclose that series of commands in curly braces:
{ compound-list ; }
Execute compound-list in the current process environment. […]
That's true for any POSIX shell (so it also works in Bash).
So your example can be changed to:
sudo mkdir -p /data/db && \
sudo chmod 755 /data/db && \
sudo chown -R addison.pan: /data && \
( mongod & )
That may be good because you want the mongod process separated. On the other hand, a more general answer would be to group the list of commands within the same shell process:
sudo mkdir -p /data/db && \
sudo chmod 755 /data/db && \
sudo chown -R addison.pan: /data && \
{ mongod & }
Both these are described in the above documentation references.
Be explicit. There's no need to try to abuse the syntax to use a short-circuit:
if \
sudo mkdir -p /data/db \
&& sudo chmod 755 /data/db \
&& sudo chown -R addison.pan: /data
then
mongod &
fi
Use parens:
sudo mkdir -p /data/db && \
sudo chmod 755 /data/db && \
sudo chown -R addison.pan: /data && \
(mongod &)
You could run multiple commands within sudo, for example:
sudo sh -c 'mkdir -p /data/db && chmod 755 /data/db && chown -R <user>: /data' \
&& mongod &
I am trying to change permissions on a user's folder that is not an administrator. I was told to run this script:
{
sudo chflags -R nouchg,nouappnd ~ $TMPDIR..
sudo chown -R $UID:staff ~ $_
sudo chmod -R u+rwX ~ $_
chmod -R -N ~ $_
} 2> /dev/null
But I am afraid that it will chown my user folder, instead of the user I am trying to fix.
this shell script should add everything put in the folder to transmission. With one folder it works fine, but when i add more then one folder at the same moment it ignores the second one.
while true;
do
file=$(inotifywait -e moved_to --format %f /srv/watchfolderfilme)
file="/srv/watchfolderfilme/$file"
transmission-create -o $file.torrent -s 16384 -t http://0.0.0.0:6969/announce $file
mv $file /srv/downloads
chmod 0777 $file.torrent
cp $file.torrent /srv/newtorrentfiles
mv $file.torrent /srv/watchfoldertorrents
done
Rethough my solution and found a better one that works fine for multiple adds
inotifywait -m /srv/watchfolderfilme -e create -e moved_to |
while read path action file; do
# echo "The file '$file' appeared in directory '$path' via '$action'"
chmod 0777 $path$file
transmission-create -o /srv/newtorrentfiles/$file.torrent -s 16384 -t http://0.0.0.0:6969/announce $path$file
mv $path$file /srv/downloads
chmod 0777 /srv/newtorrentfiles/$file.torrent
cp /srv/newtorrentfiles/$file.torrent /srv/watchfoldertorrents
done
Why is this basic variable call in my script failing?
The script is just below and the errors outputted in terminal after execution are below the script.
Line 8 is the first sudo command.
I am executing this script as root in terminal for now. It works just fine if I execute the commands manually, one-at-a-time, within terminal...
I would be grateful for any insight.
#!/bin/bash
echo Enter username
read NAME
echo Enter number
read NUM
sudo (cd /Users/$NAME && tar c .) | (cd /Users/$NUM && tar xf -)
sudo chown -R $NUM:"Domain Users" /Users/$NUM
sudo chmod g+rwx /Users/$NUM
Stephen-Kucker:Desktop root# ./stackoverflowq.txt
Enter username
jsteinberg-c
Enter number
admin
./stackoverflowq.txt: line 8: syntax error near unexpected token `cd'
./stackoverflowq.txt: line 8: `sudo (cd /Users/$NAME && tar c .) | (cd /Users/$NUM && tar xf -)'
Try this:
sudo tar -C /Users/$NAME -c . | sudo tar -C /Users/$NUM -xf -
You need to use the -s option to pass an arbitrary shell command (like the pipeline shown) to the shell with sudo:
sudo -s "(cd /Users/$NAME && tar c .) | (cd /Users/$NUM && tar xf -)"