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Calculate pi to an arbitrary number of decimal places
This is sample output - yours may be different.
2

bc -l <<< "scale=1000; 4*a(1)"

cryptology_codes · 2020-03-11 15:58:21 4
Create POSIX tar archive

tar(1) and cpio(1) are not fully platform agnostic, although their file formats are specified in POSIX.1-2001. As such, GNU tar(1) might not be able to extract a BSD tar(1) archive, and ivce versa. pax(1) is defined in POSIX.1-2001. To extract an archive: pax -rf archive.tar
This is sample output - yours may be different.
2

pax -wf archive.tar /path

atoponce · 2020-03-06 13:56:46 1
Backup with versioning
This is sample output - yours may be different.
0

& 'C:\cwRsync_5.5.0_x86_Free\bin\rsync.exe' --force --ignore-errors --no-perms --chmod=ugo=rwX --checksum --delete --backup --backup-dir="_EVAC/$(Get-Date -Format "yyyy-MM-dd-HH-mm-ss")" --whole-file -a -v "//MyServer/MyFolder" "/cygdrive/c/Backup"

pascalv · 2020-03-06 10:17:42 1
Linux system calls of MySQL process
This is sample output - yours may be different.
0

strace -c -p $(pidof -s mysqld) -f -e trace=all

shantanuo · 2020-02-27 03:35:17 20
mysql status

cron entry to record mysql status every minute
This is sample output - yours may be different.
0

mysqladmin status >> /home/status.txt 2>> /home/status_err.txt

shantanuo · 2020-02-19 10:58:27 6
add a mysql user

username is dba and password is dba123
This is sample output - yours may be different.
0

grant all on *.* to 'dba'@'localhost' identified by 'dba123' with grant option;

shantanuo · 2020-02-19 10:56:07 3
find and remove old compressed backup files

remove all compressed files in /home/ folder not created in the last 10 days
This is sample output - yours may be different.
1

find /home -type f $ -name "*.sql.gz" -o -name "*.tar.gz" -mtime +10 $ -exec rm -rf {} \;

shantanuo · 2020-02-19 10:49:28 8
find and remove old backup files

remove all files in /home/ folder that starts with bk_all_dbProdSlave and not created in the last 2 days
This is sample output - yours may be different.
0

find /home/ -name bk_all_dbProdSlave_\* -mtime +2 -exec rm -f {} \;

shantanuo · 2020-02-19 10:47:34 2
InnoDB related parameters
This is sample output - yours may be different.
0

mysqladmin variables | egrep '(innodb_log_file|innodb_data_file)'

shantanuo · 2020-02-19 10:24:52 3
mysql backup utility
This is sample output - yours may be different.
0

mysqlbackup --port=3306 --protocol=tcp --user=dba --password=dba --with-timestamp --backup-dir=/tmp/toback/ --slave-info backup-and-apply-log --innodb_data_file_path=ibdata1:10M:autoextend --innodb_log_files_in_group=2 --innodb_log_file_size=5242880

shantanuo · 2020-02-19 10:24:15 1
port forwarding

pem file used by AWS servers for additional security
This is sample output - yours may be different.
1

ssh -L8888:localhost:80 -i nov15a.pem [email protected]

shantanuo · 2020-02-19 10:20:18 4
check mysql capacity to handle traffic
This is sample output - yours may be different.
-1

mysqlslap --query=/root/select_query_cp.sql --concurrency=10 --iterations=5 --create-schema=cvts1

shantanuo · 2020-02-15 10:40:39 0
show the difference
This is sample output - yours may be different.
2

diff file1 file2 --side-by-side --suppress-common-lines

shantanuo · 2020-02-15 10:38:44 14
Change values from 0 to 100
This is sample output - yours may be different.
0

awk '{if ($3 =="LAN" && $5 == "0.00" ) print $1, $2, "LAN", "288", "100.00"; else print $1 ,$2, $3, $4, $5 }' sla-avail-2013-Feb > sla-avail-2013-Feb_final

shantanuo · 2020-02-15 10:37:44 3
Extract queries from mysql general log

queries related to table 'Invoice_template' Show Sample Output
This is sample output - yours may be different.
0

grep -Eo '( *[^ ]* *){4}Invoice_Template( *[^ ]* *){4}' /mysql-bin-log/mysql-gen.log | head -10000 | sort -u

shantanuo · 2020-02-14 08:18:58 1
Slow Down Command Output

( Or ls -lat|lolcat -a if you like it in technicolor - apt install lolcat if needed )
This is sample output - yours may be different.
2

ls -alt|awk '{if (system("sleep .5 && exit 2") != 2) exit; print}'

knoppix5 · 2020-02-13 02:59:48 1
rsync should continue even if connection lost

Manage partial uploads using append option.
This is sample output - yours may be different.
1

rsync --archive --recursive --compress --partial --progress --append [email protected]:/backup/somefile.txt.bz2 /home/ubuntu/

shantanuo · 2020-02-11 13:48:22 0
rsync using pem file

Especially useful while syncing to Amazon EC2 instance. avz stands for archive verbose compress
This is sample output - yours may be different.
0

rsync -e 'ssh -i /root/my.pem' -avz /mysql/db/data_summary.* ec2-1-2-4-9.compute-1.amazonaws.com:/mysql/test/

shantanuo · 2020-02-11 13:45:32 1
stream a youtube video with mpv where $1 is the youtube link.

opens a new session with video stream
This is sample output - yours may be different.
2

setsid mpv --input-ipc-server=/tmp/mpvsoc$(date +%s) -quiet "$1" >/dev/null 2>&1

n0a110w · 2020-02-10 12:35:11 0
check mysql server performance
This is sample output - yours may be different.
0

mysqlslap --query=/home/ec2-user/insert.txt --concurrency=123 --iterations=1 --create-schema=test

shantanuo · 2020-02-09 09:52:28 15
backup all data in compressed format

error out to a different file every day if it is part of a cron entry. The backup file will overwrite older version.
This is sample output - yours may be different.
0

mysqldump --routines --all-databases | gzip > /home/mydata.sql.gz 2> /home/mydata.date '+\%b\%d'.err

shantanuo · 2020-02-09 07:46:42 0
Check if the same table name exist across different databases

Useful command for MySQL Show Sample Output
This is sample output - yours may be different.
```
Count of databases for e.g. 3
```
0

find . -name "withdrownblocks.frm" | sort -u | awk -F'/' '{print $3}' | wc -l

shantanuo · 2020-02-09 07:22:42 2
Find a file and then copy to tmp folder

Select only the files with given name and copy them to /tmp/ folder.
This is sample output - yours may be different.
-1

for file in `ls | grep -i 'mumbai|pune|delhi'` ; do cp $file /tmp/ ; done

shantanuo · 2020-02-09 06:56:45 6
Find non-standard files in mysql data directory

These files should be removed to keep the size of data directory under control. If you exclude the known important file types like frm and MYD then what-ever is left can be either moved or deleted.
This is sample output - yours may be different.
0

find . -type f -not -name "*.frm" -not -name "*.MYI" -not -name "*.MYD" -not -name "*.TRG" -not -name "*.TRN" -not -name "db.opt"

shantanuo · 2020-02-09 06:45:50 0
Compare mysql db schema from two different servers
This is sample output - yours may be different.
0

diff <(mysqldump -hsystem db_name --no-data --routines) <(mysqldump -hsystem2 db_name --no-data --routines) --side-by-side --suppress-common-lines --width=690 | more

shantanuo · 2020-02-09 02:37:05 2
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Show most common words in filenames

I'm sure there's a more elegant sed version for the tr + grep section.

Remove comments in XML file

In Redhat, xmlstarlet is called just xml which can be found in xmlstarlet RPM.

Rename files in batch

Find all files with colons and replace with underscores; current directory and below (recursive).

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

Print a row of 50 hyphens

Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

Print just line 4 from a textfile

this method should be the fastest

Download an entire website from a specific folder on down

Gets the english pronunciation of a phrase

Sends a string to google tranlator, which converts it to English speech. It's possible to create a nice script to do the job for us, such as #!/bin'bash curl -A "Mozilla" "http://translate.google.com/translate_tts?tl=en&q=$1" > /tmp/speak.mp3 mplayer /tmp/speak.mp3

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