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I guess I'll copy and paste my answer from Stack Overflowmy answer from Stack Overflow, which people seemed to like. . .

The issue of how to run commands on many servers at once came up on a Perl mailing list the other day and I'll give the same recommendation [I gave there] 2, which is to use gsh: http://outflux.net/unix/software/gsh

gsh is similar to the "for box in box1_name box2_name box3_name" solution already given but I find gsh to be more convenient. You set up a /etc/ghosts file containing your servers in groups such as web, db, RHEL4, x86_64, or whatever (man ghosts) then you use that group when you call gsh.

[pdurbin@beamish ~]$ gsh web "cat /etc/redhat-release; uname -r" www-2.foo.com: Red Hat Enterprise Linux AS release 4 (Nahant Update 7) www-2.foo.com: 2.6.9-78.0.1.ELsmp www-3.foo.com: Red Hat Enterprise Linux AS release 4 (Nahant Update 7) www-3.foo.com: 2.6.9-78.0.1.ELsmp www-4.foo.com: Red Hat Enterprise Linux Server release 5.2 (Tikanga) www-4.foo.com: 2.6.18-92.1.13.el5 www-5.foo.com: Red Hat Enterprise Linux Server release 5.2 (Tikanga) www-5.foo.com: 2.6.18-92.1.13.el5 [pdurbin@beamish ~]$

You can also combine or split ghost groups, using web+db or web-RHEL4, for example.

I'll also mention that while I have never used shmux, its website contains a list of software (including gsh) that lets you run commands on many servers at once. Capistrano has already been mentioned and (from what I understand) could be on that list as well.

I guess I'll copy and paste my answer from Stack Overflow, which people seemed to like. . .

The issue of how to run commands on many servers at once came up on a Perl mailing list the other day and I'll give the same recommendation [I gave there] 2, which is to use gsh: http://outflux.net/unix/software/gsh

gsh is similar to the "for box in box1_name box2_name box3_name" solution already given but I find gsh to be more convenient. You set up a /etc/ghosts file containing your servers in groups such as web, db, RHEL4, x86_64, or whatever (man ghosts) then you use that group when you call gsh.

[pdurbin@beamish ~]$ gsh web "cat /etc/redhat-release; uname -r" www-2.foo.com: Red Hat Enterprise Linux AS release 4 (Nahant Update 7) www-2.foo.com: 2.6.9-78.0.1.ELsmp www-3.foo.com: Red Hat Enterprise Linux AS release 4 (Nahant Update 7) www-3.foo.com: 2.6.9-78.0.1.ELsmp www-4.foo.com: Red Hat Enterprise Linux Server release 5.2 (Tikanga) www-4.foo.com: 2.6.18-92.1.13.el5 www-5.foo.com: Red Hat Enterprise Linux Server release 5.2 (Tikanga) www-5.foo.com: 2.6.18-92.1.13.el5 [pdurbin@beamish ~]$

You can also combine or split ghost groups, using web+db or web-RHEL4, for example.

I'll also mention that while I have never used shmux, its website contains a list of software (including gsh) that lets you run commands on many servers at once. Capistrano has already been mentioned and (from what I understand) could be on that list as well.

I guess I'll copy and paste my answer from Stack Overflow, which people seemed to like. . .

The issue of how to run commands on many servers at once came up on a Perl mailing list the other day and I'll give the same recommendation [I gave there] 2, which is to use gsh: http://outflux.net/unix/software/gsh

gsh is similar to the "for box in box1_name box2_name box3_name" solution already given but I find gsh to be more convenient. You set up a /etc/ghosts file containing your servers in groups such as web, db, RHEL4, x86_64, or whatever (man ghosts) then you use that group when you call gsh.

[pdurbin@beamish ~]$ gsh web "cat /etc/redhat-release; uname -r" www-2.foo.com: Red Hat Enterprise Linux AS release 4 (Nahant Update 7) www-2.foo.com: 2.6.9-78.0.1.ELsmp www-3.foo.com: Red Hat Enterprise Linux AS release 4 (Nahant Update 7) www-3.foo.com: 2.6.9-78.0.1.ELsmp www-4.foo.com: Red Hat Enterprise Linux Server release 5.2 (Tikanga) www-4.foo.com: 2.6.18-92.1.13.el5 www-5.foo.com: Red Hat Enterprise Linux Server release 5.2 (Tikanga) www-5.foo.com: 2.6.18-92.1.13.el5 [pdurbin@beamish ~]$

You can also combine or split ghost groups, using web+db or web-RHEL4, for example.

I'll also mention that while I have never used shmux, its website contains a list of software (including gsh) that lets you run commands on many servers at once. Capistrano has already been mentioned and (from what I understand) could be on that list as well.

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Philip Durbin
Philip Durbin
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I guess I'll copy and paste my answer from Stack Overflow, which people seemed to like. . .

The issue of how to run commands on many servers at once came up on a Perl mailing list the other day and I'll give the same recommendation [I gave there] 2, which is to use gsh: http://outflux.net/unix/software/gsh

gsh is similar to the "for box in box1_name box2_name box3_name" solution already given but I find gsh to be more convenient. You set up a /etc/ghosts file containing your servers in groups such as web, db, RHEL4, x86_64, or whatever (man ghosts) then you use that group when you call gsh.

[pdurbin@beamish ~]$ gsh web "cat /etc/redhat-release; uname -r" www-2.foo.com: Red Hat Enterprise Linux AS release 4 (Nahant Update 7) www-2.foo.com: 2.6.9-78.0.1.ELsmp www-3.foo.com: Red Hat Enterprise Linux AS release 4 (Nahant Update 7) www-3.foo.com: 2.6.9-78.0.1.ELsmp www-4.foo.com: Red Hat Enterprise Linux Server release 5.2 (Tikanga) www-4.foo.com: 2.6.18-92.1.13.el5 www-5.foo.com: Red Hat Enterprise Linux Server release 5.2 (Tikanga) www-5.foo.com: 2.6.18-92.1.13.el5 [pdurbin@beamish ~]$

You can also combine or split ghost groups, using web+db or web-RHEL4, for example.

I'll also mention that while I have never used shmux, its website contains a list of software (including gsh) that lets you run commands on many servers at once. Capistrano has already been mentioned and (from what I understand) could be on that list as well.