Linux for Basis Admins

Useful commands for Basis Administrators working with Linux.

To send the output of a program by email, use a pipe:

| mailx -s "$(hostname) control_check_ora.log" adminsap@company.example

Find files modified in the last day and format the timestamp:

find /path/to/directory/* -mtime -1 | xargs ls -ldtrh --time-style="+%Y-%m-%d %H:%M:%S"

find /oracle/*/sapdata? | xargs ls -ldtrh --time-style="+%Y-%m-%d %H:%M:%S" | grep sr3.data

nc -zv webserver.local 8080

Output:

Connection to webserver.local 8080 port [tcp/*] succeeded!

Create a 10G file:

dd if=/dev/zero of=/oracle/<SID>/DELETE_IF_NECESSARY.SAP bs=1 count=0 seek=10737418240

Sync remote directories using rsync over SSH instead of SFTP:

rsync -auvz -e "ssh -l root -i <SSH_PRIV_KEY>" <source_server>:/path/to/source/directory /local/target/path

Get all .xml and .xsl files from /usr/sap/<SID>/SUM/abap/doc (root directory only).

From a Linux box, run the following commands to generate the HTML reports:

xsltproc UpgAnalysis.xsl UPGANA.XML > report.html
xsltproc SAPupPhaseList.xsl phaselist.xml > phaselist.html

Check certificate details for a web server:

curl -I https://webserver.company.example -v

Inspect the full certificate chain:

openssl s_client -showcerts -connect api.company.example:443