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Showing posts from October, 2017
sudo redirection permission denied | use tee or script
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The trouble is, this contrived example doesn't work: sudo ls -hal /root/ > /root/test.out I just receive the response: -bash: /root/test.out: Permission denied There are multiple solutions: Run a shell with sudo and give the command to it by using the -c option: sudo sh -c 'ls -hal /root/ > /root/test.out' Create a script with your commands and run that script with sudo: #!/bin/sh ls -hal /root/ > /root/test.out Run sudo ls.sh . See Steve Bennett's answer if you don't want to create a temporary file. Launch a shell with sudo -s then run your commands: [nobody@so]$ sudo -s [root@so]# ls -hal /root/ > /root/test.out [root@so]# ^D [nobody@so]$ Use sudo tee (if you have to escape a lot when using the -c option): sudo ls -hal /root/ | sudo tee /root/test.out > /dev/null The redirect to /dev/null is needed to stop tee from outputting to the screen. To a...
vi/vim :move -2 :move +2 - moves line search text and replace :%s/search/replace/gc
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vi :move -2 :move +2 - moves line in vi search text and replace :%s/search/replace/gc Here "pattern" represents the old string and "replace" represents the new string. For example, to replace each occurrence of the word "lemon" in a line with "orange," type: :s/lemon/orange/ The syntax for replacing every occurrence of a string in the entire text is similar. The only difference is the addition of a "%" in front of the "s": :%s/pattern/replace/
ssh-add -l | ssh-add -x | ssh-add -X | ssh-copy-id |
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After installing Ubuntu 16.04 I recreated my ssh keys as I forgot to back them up, but whenever I attempt to use ssh I get sign_and_send_pubkey: signing failed: agent refused operation this is slightly annoying as it lets me through to my ssh server, but git refuses to push code using ssh. I have already pushed the keys to the server by using ssh-copy-id . Looks like an ssh-agent is running already but it can not find any keys attached. To solve this add the private key identities to the authentication agent like so: ssh-add ssh-add # This will load your key into the ssh-agent session so that you can login to hosts without requiring your passphrase each time Then you can ssh into your server. in addition, you can see the list of fingerprints of all identities currently added by: ssh-add -l Example with ssh-add ~/.ssh/id_rsa Ensure the ssh-agent is running: If you are using the Git Shell that's installed with GitHub Deskt...
eval | c="echo"; a1="Hello, "; a2="World!"; eval $c $a1 $a2
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eval is a builtin command of the Bash shell. It concatenates its arguments into a single string , joining the arguments with spaces, then executes that string as a bash command. It's similar to running bash -c " string " , but eval executes the command in the current shell environment rather than creating a child shell process . The eval command is not used very often in bash. In other shells, it can be used in scripts as a way to get the value of a variable whose name is not known until the script is run. In bash, however, this can be accomplished with variable indirection using the syntax: ${! varname } Examples c="echo"; a1="Hello, "; a2="World!"; eval $c $a1 $a2 Assign strings to variables c , a1 , and a2 . Then, use eval to evaluate those arguments and join them into a single s...
rpm yum apt-get dpkg SwitchingToUbuntu/FromLinux/RedHatEnterpriseLinux
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Task Red Hat/Fedora Ubuntu Adding, Removing and Upgrading Packages Refresh list of available packages Yum refreshes each time it's used apt-get update Install a package from a repository yum install package_name apt-get install package_name Install a package file yum install package.rpm rpm -i package.rpm dpkg --install package.deb Remove a package rpm -e package_name apt-get remove package_name Remove a package with configuration files yum remove package_name apt-get purge package_name Check for package upgrades yum check-update apt-get -s upgrade apt-get -s dist-upgrade Upgrade packages yum update rpm -Uvh [args] apt-get upgrade Upgrade the entire system yum upgrade apt-get dist-upgrade Package Information Get information about an available package yum search package_name apt-cache search package_name Show available packages yum list avail...