Pak Jiddat - Innovative Software Services

Read: In the name of thy Lord Who createth, Createth man from a clot. Read: And thy Lord is the Most Bounteous, Who teacheth by the pen, Teacheth man that which he knew not. Nay, but verily man is rebellious That he thinketh himself independent!. Lo! unto thy Lord is the return. (Sura Alalaq 96:8)

Running multiple versions of mailx command

Created On: 24 Nov, 2017: 10:37:29 - Tags : command line tools | server management


Certains commands in Linux can be provided by multiple packages. The command provided by each package may differ. For example the mailx command is provided by the bsd-mailx package as well as the heirloom-mailx package. The mailx command provided by the packages use different command line parameters.

To force the system to use a command from a specific package we can use the update-alternatives command. For example the command: update-alternatives --set mailx /usr/bin/heirloom-mailx will set the mailx provided by heirloom-mailx as the default mailx command. So when we enter mailx on the command line, it will run the mailx provided by heirloom-mailx package.

The above command may give an error on Debian Stretch. If the error suggests that the mailx package has not been registered, then the error can be corrected by registering the heirloom-mailx package using the command: update-alternatives --install /usr/bin/mailx mailx /usr/bin/heirloom-mailx 10

Related Articles

  1. Deleting empty folders recursively using Linux command line tools
  2. Deleting files older than 1 year using Linux command line tools
  3. Setting file permissions with rsync
  4. Using Rsync over custom SSH port
  5. Finding name server records for domains using Dig
  6. Backing up and restoring LXD containers
  7. Ignoring errors during MySQL import
  8. Resizing Linux root partitions without unmount on Google Cloud
  9. Using PSCP command for copying files and directories
  10. Configuring SFTP/SSH access for LXC Containers
  11. Debugging programs on Linux using strace
  12. Generate Certificate Signing Request (CSR) for ssl certificates
  13. Split large files using split command in Linux
  14. Error in pushing changes to remote git repository
  15. Monitoring user activity with acct package
  16. Permanently authenticating with remote git repositories
  17. Passing command line arguments to Python script
  18. List users currently logged in
  19. Using Redir command for redirecting ports
  20. Sending email through Gmail server using mailx command
  21. Fetching website resource over https using wget
  22. Delete downloaded file using Wget
  23. Using Oauth2l
  24. How to Backup and Restore LXC containers
  25. Fix ntfs disk is corrupt error
  26. Recover deleted files on ext3/ext4 file system using Photorec
  27. Convert pdf files to text files
  28. Viewing number of files in directory
  29. Using Rsync to copy all files recursively into one folder
  30. Using SED tool for replacing text in files
  31. Automate scp command using sshpass
  32. Upgrading Postgresql from version 9.4 to 9.6
  33. Installing latest version of Php
  34. Upgrading MySQL server from version 5.6 to 8.0
  35. Upgrading R from version 3.0 to 3.5
  36. Getting /etc/rc.local file to work on Debian 9 (Stretch)
  37. Increasing number of concurrent connections for Proftp
  38. Changing ownership of symbolic link
  39. Configuring Apache to process html files as php
  40. Php server APIs
  41. Apache Multi Processing Modules (MPMs)
  42. Calculating the number of simultaneous connections supported by Apache
  43. Problem with copying large files to USB
  44. Monitoring RAM usage on server
  45. Finding CPU usage using top command
  46. Format of crontab file
  47. Force grub2 to not use UUID