Useful Linux Commands

To get the list of files with details inside a folder:
ls -l OR ll

To know the count of files inside a folder:
ls -l | wc -l

To get the count of files (whose name starts with 'FolderCreation' inside a folder):
ls -l FolderCreation20180523* | wc -l

To get the count of PDF files (which are created/modified today itself i.e 0 days before):
find ./ -type f -mtime 0 | grep "PDF" | wc -l

To get the count of PDF files (which are created/modified a day before i.e 1 day before):
find ./ -type f -mtime 1 | grep "PDF" | wc -l

To get the count of xml files (which are created/modified a day before i.e 1 day before):
find ./ -type f -mtime 1 | grep "xml" | wc -l

To move the files (created/modified) a day before, into a folder named 'FileUpload' located in parallel to the current folder you are into:
find ./ -type f -mtime 1 -exec mv {} ../FileUpload \;

To get the list of PDF files whose name starts with 'AD_' and contains '_676' in its name:
ls -l AD_*_676*.PDF | wc -l

To search for content in all files in linux:
grep -rnw . -e 'content' // r - recursive , n - line number, w - for match the whole word , dot - searching on current path

To simple search files recursively:
find . -name "filename*"
find . -name "filename" //if you are sure about the exact file name

To change owner of file:
chown <new_owner_name> <filename>

To change group of file:
chown :<new_group_name> <filename>
ex: chown :Domain\ Users abc.pdf //this is because my group 'Domain Users' contain space

To change both owner and group of file:
chown <new_owner_name>:<new_group_name> <filename>

Courtesy : https://www.thegeekstuff.com/2012/06/chown-example...

To copy a line in vim editor:
yy

To copy multiple lines (ex: 4 lines from current line) in vim:
yy4yy

To paste:
p

To delete a line in vim:
dd

To send/test email by specifying smtp server name:
mailx -S smtp="smtp.xxx.xxxx.com" -r "admin@alfresco.com" -s "Test" -v -t "firstname.lastname@abc.com" "Test"

Sending email (static) without smtp server (default smtp server) with echo/output:
echo "test" | mailx -S -r "admin@alfresco.com" -s "Test" -v "xxx.yyyy@abc.com"

Sending email (dynamic) with echo/output:
echo "$BODY" | mailx -S smtp="smtp.xxx.xxxx.com" -r "admin@$(hostname)" -s "$SUBJECT" -v "xxxxyyyy@abc.com"

Setting cron expression (crontab) to execute at fixed schedule:
1) Command prompt [...]$: crontab -l //this will show you list of already configured/scheduled cron expressions
2) Command prompt [...]$: crontab -e //this will allow you to edit/add your own cron expression to the list. Example:
#Crontab for checking a script every 2 hours
0 2 * * * /opt/services/test-service.sh

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SCP command to copy file(s) from one server to another:
a) From QA to DEV:
Login to DEV server (go to path example: /opt/alfresco5/tomcat/webapps/).
Now to copy ABC.war from QA server to DEV current path:
scp alfresco@qaalfserver1.xx.xxx.com:/opt/alfresco/tomcat/webapps/ABC.war .

b) From DEV to QA:
scp alfresco@devalfserver1.xx.com:/opt/alfresco5/amps/abc.amp .
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Install AMP(s) using alfresco-mmt.jar command: (navigate to /opt/alfresco/bin/ - before firing below commands; and make sure alfresco-mmt.jar exists at this location)

a) Installing repo amp into alfresco.war:
java -jar alfresco-mmt.jar install APP_NAME-1.0.amp alfresco.war

b) Installing share amp into share.war:
java -jar alfresco-mmt.jar install APP_NAME_SHARE-1.0.amp share.war

c) To see the list of AMPs already installed:
java -jar alfresco-mmt.jar list alfresco.war
java -jar alfresco-mmt.jar list share.war

d) To uninstall amp(s) from alfresco.war or share.war (current dir: /opt/alfresco/)
java -jar bin/alfresco-mmt.jar uninstall xxx-share-amp tomcat/webapps/share.war
java -jar bin/alfresco-mmt.jar uninstall xxx-repo-amp tomcat/webapps/alfresco.war

e) To install amp(s) into alfresco.war or share.war (current dir: /opt/alfresco/)
NOTE: Appending '-force' at the end is optional, append it only if required.
java -jar bin/alfresco-mmt.jar install amps/xxx-repo.amp tomcat/webapps/alfresco.war -force
java -jar bin/alfresco-mmt.jar install amps_share/xxx-share-1.0.amp tomcat/webapps/share.war -force
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Copy command:
a) Copy recursively entire folder contents from one to another location on same server:
cp -r keystore /data/alf_data/ABC/

b) Normal file(s) copy:
cp /opt/app/alfresco5/amps/* . //this will copy all files under amps folder to current loc
cp /opt/app/alfresco5/amps/xxx-repo.amp . //this will copy xxx-repo.amp under amps folder to current loc

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To install httpd / apache service:
sudo yum install -y httpd
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Test email from command prompt linux:
$ echo "something" | mailx -s "subject" sanket.mehta@ge.com
echo "Body" | mailx -r "sanket.mehta@ge.com" -s "SUBJECT" "sanket.mehta@ge.com"

sudo mailx -S smtp="smtp.*****.com" -r "sanket.mehta@ge.com" -s "SUBJECT" -v "sanket.mehta@ge.com"

sudo mail -S smtp="smtp.*****.com" -r "sanket.mehta@ge.com" -s "SUBJECT" -v "sanket.mehta@ge.com"

sudo mail -S smtp=smtp.*****.com -r sanket.mehta@ge.com -s SUBJEC -v sanket.mehta@ge.com
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source ~/.bash_profile  //to set path,java home when jar is not running
 
grep -r "214***30" /opt/****Files/     //to search for content inside the files on the mentioned path

grep -r "J-18-007442" /opt/***Files/

ps aux --sort -rss  //list out the processes in ascending order which occupies high memory

grep -r "any_content" /opt/***Files/archived/2019-02-15 | wc -l   //to get count of files

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For SSH Key:
ssh -i private_openssh.pem SSO@pwnxxxxx.xxxx.com
cp /home/SSO/private_openssh.ppk .

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For checking port opened or not with telnet or nmap command:

NMAP examples for checking connectivity/opened port between nodes/instances:

Ex: ARender node to 5 Repo nodes:

nmap -p 8761,8080 -Pn <Repo1_IP> <Repo2_IP> <Repo3_IP> <Repo4_IP> <Repo5_IP>

Tracker OR Sched OR Repo OR Integ node to 1 Transformation node:

nmap -p 61616,8090,8099,8161,8095,8100 -Pn <TNF_IP>

Tracker OR Sched OR Repo OR Integ node to 1 AMQ:

nmap -p 61616 -Pn <AMQ_NODE_IP>

Tracker OR Sched OR Repo OR Integ node to 12 Solr shards :

nmap -p 8983 -Pn <Shard0_IP> <Shard2_IP> ...  <Shard11_IP>

Tracker OR Sched OR Repo OR Integ node OR Solr shard to RDS:

nmap -p 1521 -Pn <RDS_HOSTNAME>

Tracker OR Sched OR Repo OR Integ node to ARender LB:

nmap -p 80 -Pn i<ARENDER_LB>

Tracker OR Sched OR Repo OR Integ node to S3:

aws s3 ls

TNF to 5 Repos:

nmap -p 8095,8080,8100,61616 -Pn <Repo1_IP> <Repo2_IP> <Repo3_IP> <Repo4_IP> <Repo5_IP>

TNF to 1 AMQ. node:

nmap -p 61616 -Pn <AMQ_IP>

Solr Shard to 4 Trackers:

nmap -p 8080 -Pn <TRK1_IP> <TRK2_IP> <TRK3_IP> <TRK4_IP>

Solr Shard to 5 Repos:

nmap -p 8080 -Pn <Repo1_IP> <Repo2_IP> <Repo3_IP> <Repo4_IP> <Repo5_IP>

Repo, Tracker, Sched, Integ. node to Solr LB:

nmap -p 80 -Pn <SOLR_LB>

Check clustering port 5701 is opened between repo nodes:

nmap -p 5701 -Pn <Repo1_IP> <Repo2_IP> <Repo3_IP> <Repo4_IP> <Repo5_IP>

For telnet:

telnet IP_ADDRESS PORT_NAME

example:  telnet IP_ADDRESS 8983

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Find an occurence of a string within a file:

grep "rds_host:1521:sid" alfresco-global.properties

Replace all occurences of a string within a file:

sed -i 's/rds_host:1521:sid/rds_new_host:1521:new_sid/g' alfresco-global.properties

Replace all IP occurences with other IP in a file:

Syntax: sed -i 's/source_ip_to_find/new_ip_to_replace_old_ip/g' alfresco-global.properties

Example: sed -i 's/172.50.2.249/172.60.2.246/g' alfresco-global.properties

Replace all occurences by taking backup of original file:

sed -i.bak 's/rds_host:1521:sid/rds_new_host:1521:new_sid/g' alfresco-global.properties

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zip and unzip commands:

To zip a folder recursively:

zip -r filename.zip directory

To unzip a zip file into a folder:

unzip filename.zip -d /opt

OR

If you want to unzip at current location or current dir only, then :

unzip filename.zip -d .     

OR

unzip filename.zip

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rsync command:

Syntax:    rsync src_filename username@IP_ADDRESS:/destination_path/

Example: rsync data.zip admin@172.xxx.xx.xxx:/opt/

Creating symlink of a jdk path to another jdk path:

ln -s /software/java/jdk-11.0.2/bin/java /usr/bin/java

Creating symlink of a libreoffice path to another path:

ln -s /opt/libreoffice6.3/program/soffice /usr/bin/java

Set envt:

set-environment PATH=/sbin:/bin:/usr/sbin:/usr/bin:/software/java/jdk-11.0.2/bin:/opt/libreoffice6.3/program:/usr/lib:/usr/local/lib