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Special Forums Cybersecurity Use command 2 incase command 1 fails Post 303029127 by mohtashims on Tuesday 22nd of January 2019 02:42:15 AM
Old 01-22-2019
Use command 2 incase command 1 fails

I try to fire grep command on remote servers using ssh like below:

Code:
sshpass -p mypassword ssh -t user1@mach2 "grep -e word1 -e word2 /var/out.txt"

The issue is that i wish to run the same grep command which searches for multiple strings in a file on remote servers with different Operating Systems as below.

Code:
Linux mach1 2.6.18-436.el5 #1 SMP Thu Nov 22 06:38:01 EST 2018 x86_64 x86_64 x86_64 GNU/Linux

SunOS mach2 5.10 Generic_150400-63 sun4u sparc SUNW,SPARC-Enterprise

On SunOS grep fails however /usr/xpg4/bin/grep works fine.

How can i tweak my ssh command to switch between grep and /usr/xpg4/bin/grep so it works without failing on both flavors of OS ?
 

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SSH-COPY-ID(1)						      General Commands Manual						    SSH-COPY-ID(1)

NAME
ssh-copy-id - install your public key in a remote machine's authorized_keys SYNOPSIS
ssh-copy-id [-i [identity_file]] [user@]machine DESCRIPTION
ssh-copy-id is a script that uses ssh to log into a remote machine and append the indicated identity file to that machine's ~/.ssh/autho- rized_keys file. If the -i option is given then the identity file (defaults to ~/.ssh/id_rsa.pub) is used, regardless of whether there are any keys in your ssh-agent. Otherwise, if this: ssh-add -L provides any output, it uses that in preference to the identity file. If the -i option is used, or the ssh-add produced no output, then it uses the contents of the identity file. Once it has one or more fin- gerprints (by whatever means) it uses ssh to append them to ~/.ssh/authorized_keys on the remote machine (creating the file, and directory, if necessary.) NOTES
This program does not modify the permissions of any pre-existing files or directories. Therefore, if the remote sshd has StrictModes set in its configuration, then the user's home, ~/.ssh folder, and ~/.ssh/authorized_keys file may need to have group writability disabled manu- ally, e.g. via chmod go-w ~ ~/.ssh ~/.ssh/authorized_keys on the remote machine. SEE ALSO
ssh(1), ssh-agent(1), sshd(8) OpenSSH 14 November 1999 SSH-COPY-ID(1)
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