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crontab editing

crontab Cron (aka Crontab) is a task scheduler in Linux that helps to execute a task on a scheduled time, and it is very similar to Windows Task Schedulers. With crontab, we can schedule repetitive tasks as well as one-time tasks using @ utility. Crontab is mostly used for executing backup scripts for taking the system backups and also sometimes to start and stop applications. Crontab Install Crontab The package name of crontab in CentOS / RHEL is cronie and cron in Ubuntu / Debian. You can install crontab using the below command. ### CentOS / RHEL ### yum -y install cronie ### Debian / Ubuntu ### apt-get install cron Start Crontab If the crontab is not running, then start it using the following command. service crond start Edit crontab To add or edit crontab jobs of a current logged in user, use the below command. The command will open a file editor where you can update the jobs. crontab -e To edit other users crontab jobs, use the below command...
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Linux interview questions

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Linux questions Combined 1) What is Bootstraping? In general, bootstrapping usually refers to a self-starting process that is supposed to proceed without external input. In computer technology the term (usually shortened to booting) usually refers to the process of loading the basic software into the memory of a computer after power-on or general reset, especially the operating system which will then take care of loading other software as needed. 2) What is the difference between UNIX and LINUX? Unix originally began as a propriety operating system from Bell Laboratories, which later on spawned into different commercial versions. On the other hand, Linux is free, open source and intended as a non-propriety operating system for the masses. 3) What is BASH? BASH is short for Bourne Again SHell. It was written by Steve Bourne as a replacement to the original Bourne Shell (represented by /bin/sh). It combines all the features from the original version of Bourne She...
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History Commands

    1  yum repolist     2  rm k     3  rm /root/k     4  cd /root/k     5  cd /root     6  ll     7  cd /etc/yum.repos.d/     8  ll     9  rm root_k.repo    10  yum repolist    11  yum update --security    12  yum repolist    13  ps ax    14  ps aux    15  ps ax|grep emacs    16  top    17  gnome-system-monitor    18  systemctl enable --now cockpit.socket    19  hostname    20  free    21  free -m    22  lsblk    23  blk    24  blkid    25  lsblk -l    26  blkid sda1    27  blkid sda2    28  blkid /dev/sda2    29  blkid -po ude...
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