echo

By -

bash-3.00# echo -e '123\n456'
123
456

bash-3.00# echo -e 'test1\ntest2\n\ntest3\n'
test1
test2

test3

bash-3.00# echo -e 'test1\ntest2\n\ntest3\n' | sed '/^$/d'
test1
test2
test3
---------------
bash-3.00# echo -e '123\n456'
123
456

bash-3.00# echo '123\n456'
123\n456


Comments

Post a Comment

Popular posts from this blog

15 managing disk - understanding /etc/fstab xfs_admin mount -o rw,remount /

By OK -
the classical way to mount filelsystems automatically is to use fstab there is another method which is based on systemd [root@svn ~]# cat /etc/fstab # # /etc/fstab # Created by anaconda on Wed Apr 26 17:25:59 2017 # # Accessible filesystems, by reference, are maintained under '/dev/disk' # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info # /dev/mapper/cl-root     /                       xfs     defaults        0 0 UUID=6e3708b2-09ea-43f3-b0f0-9b43a157b3b1 /boot                   xfs     defaults        0 0 /dev/mapper/cl-swap     swap                    swap    defaults        0 0 [root@svn ~]#  #description /boot - where you want to mount filesystem xfs - filesystem defaults ...
Read more

tomcat catalina coyote jasper cluster

By OK -
Tomcat Component are Catalina Coyote Jasper Cluster Catalina :  Catalina is the name of the servlet container of Apache Tomcat since version 4.x. Tomcat implements Sun Microsystems' specifications for servlet and JavaServer Pages (JSP), which are important Java-based Web technologies. Tomcat's servlet container was redesigned as Catalina in Tomcat version 4.x. other components of the Tomcat engine are: Tomcat Jasper which converts the code portions within JavaServer Pages into servlets and pass them to Catalina to process. Tomcat Coyote which is an HTTP connector based on HTTP/1.1 specifications that receives and transmits web requests to the Tomcat engine by listening to a TCP/IP port and returns requests back to the requesting client. Coyote :  The Coyote JK Connector element represents a Connector component that communicates with a web connector via the JK protocol (also known as the AJP protocol). This is used for cases where you wish to invisibly integ...
Read more

list services on startup | initctl list | service --status-all | systemctl list-unit-files --type=service

By OK -
The quick answer is: It depends on your  init  system. The long answer is: For current versions of Ubuntu, you probably have a mix of  Upstart , and  SystemV . Newer versions of Ubuntu after 15.04 "Vivid Vervet" (and other Linux distros like RHEL/CentOS 7) are moving to use  SystemD . Upstart Upstart Documentation To list all services: initctl list To list all Upstart services and run  initctl show-config  on them, this one-liner may be helpful: initctl list | awk '{ print $1 }' | xargs -n1 initctl show-config System V SysV Runlevels Documentation To list all services: service --status-all OR: # for init scripts: ls /etc/init.d/ # for runlevel symlinks: ls /etc/rc*.d/ SystemD SystemD for Upstart Users FedoraProject SystemD Documentation RHEL 7: Managing Services with SystemD RedHat: SystemD Overview To list all services: systemctl list-unit-files --type=service OR: ls /lib/systemd/system/*.service /etc/systemd...
Read more