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→Killswitch When ssh user logs in
'''BASH Scripting'''
'''BASH Scripting'''
== Hello World ==
==Hello World==
<source lang="bash">
<source lang="bash">
#!/bin/bash
#!/bin/bash
</source>
</source>
== Variables ==
==Variables==
=== Local Variables ===
===Local Variables===
<source lang="bash">
<source lang="bash">
#!/bin/bash
#!/bin/bash
echo $HELLO
echo $HELLO
</source>
</source>
=== Boolean ===
===Boolean===
<source lang="bash">
<source lang="bash">
#!/bin/bash
#!/bin/bash
</source>
</source>
== Print ==
==Print==
=== Print to stderr ===
===Print to stderr===
f_pinta_error () {
f_pinta_error () {
v_TIMESTAMP=$(date +${v_FORMATO_TIMESTAMP})
v_TIMESTAMP=$(date +${v_FORMATO_TIMESTAMP})
}
}
== Strings ==
==Strings==
== Loops ==
==Loops==
=== While ===
===While===
<source lang="bash">
<source lang="bash">
#!/bin/bash
#!/bin/bash
</source>
</source>
=== For ===
===For===
<source lang="bash">
<source lang="bash">
#!/bin/bash
#!/bin/bash
</source>
</source>
=== C-like for ===
===C-like for===
<source lang="bash">
<source lang="bash">
#!/bin/bash
#!/bin/bash
done
done
</source>
</source>
=== Loop files ===
===Loop files===
while read p; do echo $p|underscore pretty ; done < /tenkaichi/boo/done/krilin_2017-12-21T12:45:29.544997.jl.boo
while read p; do echo $p|underscore pretty ; done < /tenkaichi/boo/done/krilin_2017-12-21T12:45:29.544997.jl.boo
=== Loop files in directory ===
===Loop files in directory===
With paths:
With paths:
<source lang="bash">for filename in /usr/bin/*; do echo $filename; done</source>
Without path:
Without path:
<source lang="bash">for i in $(ls /usr/bin);do echo $i; done;</source>
=== Until ===
===Until===
<source lang="bash">
<source lang="bash">
#!/bin/bash
#!/bin/bash
</source>
</source>
== Conditional ==
==Conditional==
=== if ===
===if===
<source lang="bash">
<source lang="bash">
#!/bin/bash
#!/bin/bash
</source>
</source>
=== case ===
===case===
<source lang="bash">
<source lang="bash">
#!/bin/bash
#!/bin/bash
</source>
</source>
== User Input ==
==User Input==
<source lang="bash">
<source lang="bash">
#!/bin/bash
#!/bin/bash
done
done
</source>
</source>
=== Password prompt ===
===Password prompt===
<source lang="bash">
<source lang="bash">
read -s -p "Password: " PASSWORD
read -s -p "Password: " PASSWORD
</source>
</source>
== Arrays ==
==Arrays==
<source lang="bash">
<source lang="bash">
ARRAY=(one two three)
ARRAY=(one two three)
</source>
</source>
== Functions ==
==Functions==
<source lang="bash">
<source lang="bash">
function quit {
function quit {
fun1 || fun2 will only run fun2 if fun1 returns a 0 value<br />
fun1 || fun2 will only run fun2 if fun1 returns a 0 value<br />
== Redirections ==
==Redirections==
=== stdout 2 file ===
===stdout 2 file===
ls -l > ls-l.txt
ls -l > ls-l.txt
=== stderr 2 file ===
===stderr 2 file===
grep da * 2> grep-errors.txt
grep da * 2> grep-errors.txt
=== stdout 2 stderr ===
===stdout 2 stderr===
grep da * 1>&2
grep da * 1>&2
=== stderr 2 stdout ===
===stderr 2 stdout===
grep * 2>&1
grep * 2>&1
=== stderr and stdout 2 file ===
===stderr and stdout 2 file===
rm -f $(find / -name core) &> /dev/null
rm -f $(find / -name core) &> /dev/null
== extras ==
==Extras==
=== Backup Hard Drive ===
===Killswitch When ssh user logs in===
USAGE="./$(basename ${0}) UUID output.iso"
<syntaxhighlight lang="bash">
#!/bin/bash
ME=10.0.253.131
while true; do
OTHER=$( who | grep -v tmux | grep -v ${ME} )
if [ -z "${OTHER}" ]; then
echo "No one"
else
tmux kill-session -t test
fi
sleep 5
done
</syntaxhighlight><br />
===Set files and folder permissions===
<syntaxhighlight lang="bash">
#!/bin/sh
# syntax: setperm.s destdir
#
destdir=/var/www/rrahome
dirmode=0770
filemode=0660
find $destdir -type f -exec chmod ${filemode} {} \;
find $destdir -type d -exec chmod ${dirmode} {} \;
</syntaxhighlight>
===Backup Hard Drive===
<source lang="bash">#!/bin/bash
USAGE="./$(basename ${0}) UUID output_filename"
BACKUP_ROOT=/mnt/backup
if [ -z "${1}" ]; then
if [ -z "${1}" ]; then
fi
fi
HD=$(blkid | grep $1 | awk -F : '{print $1}')
HD=$(blkid | grep $1 | awk -F : '{print $1}')
ISO=${BACKUP_ROOT}/$(hostname)/$(date '+%Y/%m')/$2.iso
ISO=${BACKUP_ROOT}/$(hostname)/$(date '+%Y/%m')/$2.iso
dd if=${HD} of=${ISO} bs=1M</source>
dd if=${HD} of=${ISO} bs=1M</source>
=== Ping IP range ===
===Extract date from string===
<syntaxhighlight lang="bash">
#!/bin/bash
DATE=$( echo ${FILE} | grep -Eo '[[:digit:]]{4}-[[:digit:]]{2}-[[:digit:]]{2}' )
</syntaxhighlight>
===Ping IP range===
<source lang="bash">#!/bin/bash
# cat ping_result.txt | grep ttl | awk '{print $4}' | sed s/:/''/g| sort | uniq
# cat ping_result.txt | grep ttl | awk '{print $4}' | sed s/:/''/g| sort | uniq
BASE=192.168.0.
BASE=192.168.0.
ping -c 3 ${BASE}$i >> ping_result.txt
ping -c 3 ${BASE}$i >> ping_result.txt
done</source>
done</source>
=== Check if a package is installed ===
===Check if a package is installed===
<source lang="bash">
<source lang="bash">
#!/bin/sh
#!/bin/sh
debInst terminator
debInst terminator
</source>
</source>
=== Check if a file exists ===
===Check if a file exists===
<source lang="bash">
<source lang="bash">
if [ -f $FILE1 ]
if [ -f $FILE1 ]
</source>
</source>
=== Check if directory exists ===
===Check if directory exists===
<source lang="bash">
<source lang="bash">
#!/bin/bash
#!/bin/bash
</source>
</source>
=== Check user ===
===Check user===
<source lang="bash">
<syntaxhighlight lang="bash">
#!/bin/bash
if [ "$EUID" -ne 0 ]
then echo "Please run as root"
exit
fi
</syntaxhighlight><source lang="bash">
#!/bin/bash
#!/bin/bash
user=$(whoami)
user=$(whoami)
fi
fi
</source>
</source>
=== Execute localScript on remote server ===
===Execute localScript on remote server===
<nowiki>ssh [user]@[server] 'bash -s' < [local_script]</nowiki>
<nowiki>ssh [user]@[server] 'bash -s' < [local_script]</nowiki>
=== Remove directorys ===
===Remove directorys===
<source lang="bash">
<source lang="bash">
#!/bin/sh
#!/bin/sh
~/myfolder3/$1/thisisafolder
~/myfolder3/$1/thisisafolder
EOF
EOF
</source>
</source><br />
=== Check if variable is set ===
===Check if variable is set===
if [ -z ${var+x} ]; then echo "var is unset"; else echo "var is set to '$var'"; fi
if [ -z ${var+x} ]; then echo "var is unset"; else echo "var is set to '$var'"; fi
=== Check command success ===
===Check command success===
<source lang="bash">#!/bin/bash
###########################################
###########################################
# Pull latest code & #
# Pull latest code & #
</source>
</source>
=== Ubuntu proxy setup ===
===Ubuntu proxy setup===
<source lang="bash">
<source lang="bash">
#! /bin/bash
#! /bin/bash
</source>
</source>
=== Git check version ===
===Git check version===
<source lang="bash">#!/bin/bash
function set_upstream() {
function set_upstream() {
}
}
check_latest_version</source>
check_latest_version</source>
=== Git check for updates and prompt to update ===
===Git check for updates and prompt to update===
<source lang="bash">
<source lang="bash">
#!/bin/bash
#!/bin/bash
</source>
</source>
=== Logging ===
===Logging===
For logging, you can wrap sections of your script in curly braces and redirect the stdout to a log file:
For logging, you can wrap sections of your script in curly braces and redirect the stdout to a log file:
<source lang=bash>
<source lang="bash">
{
{
script_command_1
script_command_1
</source>
</source>
=== Links ===
===Links===
[http://tldp.org/LDP/abs/html/ Advanced Bash-Scripting Guide]
[http://tldp.org/LDP/abs/html/ Advanced Bash-Scripting Guide]