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BASH (view source)

Revision as of 14:19, 13 April 2021

8,584 bytes added ,  14:19, 13 April 2021
m
→‎Killswitch When ssh user logs in
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== BASH Script ==
+
'''BASH Scripting'''
−
=== Hello World ===
+
==Hello World==
 
<source lang="bash">
 
<source lang="bash">
 
#!/bin/bash
 
#!/bin/bash
Line 7: Line 7:  
</source>
 
</source>
   −
=== Variables ===
+
==Variables==
−
==== Local Variables ====
+
===Local Variables===
 
<source lang="bash">
 
<source lang="bash">
 
#!/bin/bash
 
#!/bin/bash
Line 20: Line 20:  
echo $HELLO
 
echo $HELLO
 
</source>
 
</source>
−
==== Boolean ====
+
===Boolean===
 +
<source lang="bash">
 
#!/bin/bash
 
#!/bin/bash
 
the_world_is_flat=true
 
the_world_is_flat=true
Line 27: Line 28:  
     echo 'Be careful not to fall off!'
 
     echo 'Be careful not to fall off!'
 
fi
 
fi
 +
</source>
 +
 +
==Print==
 +
===Print to stderr===
 +
f_pinta_error () {
 +
v_TIMESTAMP=$(date +${v_FORMATO_TIMESTAMP})
 +
>&2 echo "${v_TIMESTAMP} $1"
 +
}
 +
 +
==Strings==
   −
=== Strings ===
+
==Loops==
−
=== Loops ===
+
===While===
−
==== While ====
   
<source lang="bash">
 
<source lang="bash">
 
#!/bin/bash
 
#!/bin/bash
Line 40: Line 50:  
</source>
 
</source>
   −
==== For ====
+
===For===
 
<source lang="bash">
 
<source lang="bash">
 
#!/bin/bash
 
#!/bin/bash
Line 48: Line 58:  
</source>
 
</source>
   −
=== Conditional ===
+
Example: git pull from all repositories in a pwd
−
==== if ====
+
<source lang="bash">
 +
for i in $( ls ); do cd $i; git pull; cd ..; done
 +
</source>
 +
 
 +
===C-like for===
 +
<source lang="bash">
 +
#!/bin/bash
 +
for i in `seq 1 10`;
 +
do
 +
    echo $i
 +
done
 +
</source>
 +
===Loop files===
 +
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===
 +
With paths:
 +
<source lang="bash">for filename in /usr/bin/*; do echo $filename; done</source>
 +
Without path:
 +
<source lang="bash">for i in $(ls /usr/bin);do echo $i; done;</source>
 +
 
 +
===Until===
 +
<source lang="bash">
 +
#!/bin/bash
 +
COUNTER=20
 +
until [ $COUNTER -lt 10 ]; do
 +
    echo COUNTER $COUNTER
 +
    let COUNTER-=1
 +
done
 +
</source>
 +
 
 +
==Conditional==
 +
===if===
 
<source lang="bash">
 
<source lang="bash">
 
#!/bin/bash
 
#!/bin/bash
Line 61: Line 103:  
</source>
 
</source>
   −
==== case ====
+
===case===
 
<source lang="bash">
 
<source lang="bash">
 
#!/bin/bash
 
#!/bin/bash
Line 69: Line 111:  
     * ) echo "Elije y/n";;
 
     * ) echo "Elije y/n";;
 
esac
 
esac
 +
 +
#!/bin/bash
 +
# naclient <login|logout|status|guistatus> [-profile <profile name>] [ -user <user-name>] [-password  <password>]
 +
 +
 +
function start_vpn(){
 +
    naclient login -profile Multi-OS  -user xe54512 -password  *******
 +
}
 +
 +
 +
function stop_vpn(){
 +
    naclient logout
 +
}
 +
 +
function status_vpn(){
 +
    naclient status
 +
}
 +
 +
case $1 in
 +
    start ) start_vpn;;
 +
    stop ) stop_vpn;;
 +
    status ) status_vpn;;
 +
    * ) echo "Unknown command";;
 +
esac
 +
 
</source>
 
</source>
   −
=== User Input ===
+
==User Input==
 
<source lang="bash">
 
<source lang="bash">
 
#!/bin/bash
 
#!/bin/bash
Line 82: Line 149:  
     esac
 
     esac
 
done
 
done
 +
</source>
 +
===Password prompt===
 +
<source lang="bash">
 +
read -s -p "Password: " PASSWORD
 
</source>
 
</source>
   −
=== Arrays ===
+
==Arrays==
 
<source lang="bash">
 
<source lang="bash">
 
ARRAY=(one two three)
 
ARRAY=(one two three)
Line 103: Line 174:  
</source>
 
</source>
   −
=== Functions ===
+
==Functions==
 
<source lang="bash">
 
<source lang="bash">
 
function quit {
 
function quit {
Line 116: Line 187:  
echo foo
 
echo foo
 
</source>
 
</source>
−
=== extras ===
+
 
−
==== Check if a package is installed ====
+
return can only be an integer between 0-255 (0=success); to get the return value (if you just want to return an integer 0-255) is $?<br />
 +
To return something else use echo so output can be captured with $(func)<br />
 +
fun1 || fun2 will only run fun2 if fun1 returns a 0 value<br />
 +
 
 +
==Redirections==
 +
===stdout 2 file===
 +
ls -l > ls-l.txt
 +
===stderr 2 file===
 +
grep da * 2> grep-errors.txt
 +
===stdout 2 stderr===
 +
grep da * 1>&2
 +
===stderr 2 stdout===
 +
grep * 2>&1
 +
===stderr and stdout 2 file===
 +
rm -f $(find / -name core) &> /dev/null
 +
==Extras==
 +
 
 +
===Killswitch When ssh user logs in===
 +
<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
 +
    echo ${USAGE}
 +
    exit
 +
fi
 +
if [ -z "${2}" ]; then
 +
    echo ${USAGE}
 +
    exit
 +
fi
 +
 
 +
HD=$(blkid | grep $1 | awk -F : '{print $1}')
 +
ISO=${BACKUP_ROOT}/$(hostname)/$(date '+%Y/%m')/$2.iso
 +
 
 +
dd if=${HD} of=${ISO} bs=1M</source>
 +
 
 +
===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
 +
BASE=192.168.0.
 +
for i in {1..126}; do
 +
    ping -c 3 ${BASE}$i >> ping_result.txt
 +
done</source>
 +
===Check if a package is installed===
 
<source lang="bash">
 
<source lang="bash">
 
#!/bin/sh
 
#!/bin/sh
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debInst terminator
 
debInst terminator
 
</source>
 
</source>
−
==== Check if a file exists ====
+
===Check if a file exists===
 +
<source lang="bash">
 +
if [ -f $FILE1 ]
 +
then
 +
if [ -f $FILE2 ]
 +
then
 +
  echo OK
 +
  # MAIN PROGRAM HERE
 +
fi
 +
fi
 +
</source>
 +
 
 +
===Check if directory exists===
 
<source lang="bash">
 
<source lang="bash">
 
#!/bin/bash
 
#!/bin/bash
Line 143: Line 305:  
</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)
Line 156: Line 324:  
fi
 
fi
 
</source>
 
</source>
 +
===Execute localScript on remote server===
 +
<nowiki>ssh [user]@[server] 'bash -s' < [local_script]</nowiki>
 +
 +
===Remove directorys===
 +
<source lang="bash">
 +
#!/bin/sh
 +
die () {
 +
    echo >&2 "$@"
 +
    exit 1
 +
}
 +
 +
[ "$#" -eq 1 ] || die "1 argument required, $# provided"
 +
echo $1 | grep -E -q '^[0-9]+$' || die "Numeric argument required, $1 provided"
 +
 +
while read dir
 +
do
 +
    [ -d "$dir" ] || die "Directory $dir does not exist"
 +
    rm -rf "$dir"
 +
done <<EOF
 +
~/myfolder1/$1/anotherfolder
 +
~/myfolder2/$1/yetanotherfolder
 +
~/myfolder3/$1/thisisafolder
 +
EOF
 +
</source><br />
 +
===Check if variable is set===
 +
if [ -z ${var+x} ]; then echo "var is unset"; else echo "var is set to '$var'"; fi
 +
===Check command success===
 +
 +
<source lang="bash">#!/bin/bash
 +
###########################################
 +
#          Pull latest code &            #
 +
#      Restart application services      #
 +
###########################################
 +
 +
OK="[\033[01;32m OK \033[01;36m]\033[01;00m"
 +
FAIL="[\033[01;33m FAIL \033[01;36m]\033[01;00m"
 +
LOG_FILE=/dev/null
 +
 +
function check_success {
 +
    if [ $? -eq 0 ]; then
 +
        echo -e ${OK}
 +
    else
 +
        echo -e ${FAIL}
 +
    fi
 +
}
 +
 +
 +
git pull
 +
cd /home/cpc/cpc
 +
./post_pull.sh
 +
 +
echo -en "\033[01;36m    Restarting Gunicorn ... "
 +
sudo /usr/sbin/service gunicorn restart &> ${LOG_FILE}
 +
check_success
 +
 +
echo -en "\033[01;36m    Restarting Daphne ... "
 +
sudo /usr/sbin/service daphne restart &> ${LOG_FILE}
 +
check_success
 +
 +
echo -en "\033[01;36m    Restarting Celery ... "
 +
sudo /usr/sbin/service celery restart &> ${LOG_FILE}
 +
check_success
 +
 +
echo -en "\033[01;36m    Restarting CeleryBeat ... "
 +
sudo /usr/sbin/service celerybeat restart &> ${LOG_FILE}
 +
check_success
 +
</source>
 +
 +
===Ubuntu proxy setup===
 +
<source lang="bash">
 +
#! /bin/bash
 +
HTTP_PROXY_HOST=proxy.example.com
 +
HTTP_PROXY_PORT=3128
 +
HTTPS_PROXY_HOST=proxy.example.com
 +
HTTPS_PROXY_PORT=3128
 +
 +
gsettings set org.gnome.system.proxy mode manual
 +
gsettings set org.gnome.system.proxy.http host "$HTTP_PROXY_HOST"
 +
gsettings set org.gnome.system.proxy.http port "$HTTP_PROXY_PORT"
 +
gsettings set org.gnome.system.proxy.https host "$HTTPS_PROXY_HOST"
 +
gsettings set org.gnome.system.proxy.https port "$HTTPS_PROXY_PORT"
 +
 +
sudo sed -i.bak '/http[s]::proxy/Id' /etc/apt/apt.conf
 +
sudo tee -a /etc/apt/apt.conf <<EOF
 +
Acquire::http::proxy "http://$HTTP_PROXY_HOST:$HTTP_PROXY_PORT/";
 +
Acquire::https::proxy "http://$HTTPS_PROXY_HOST:$HTTPS_PROXY_PORT/";
 +
EOF
 +
 +
sudo sed -i.bak '/http[s]_proxy/Id' /etc/environment
 +
sudo tee -a /etc/environment <<EOF
 +
http_proxy="http://$HTTP_PROXY_HOST:$HTTP_PROXY_PORT/"
 +
https_proxy="http://$HTTPS_PROXY_HOST:$HTTPS_PROXY_PORT/"
 +
EOF
 +
</source>
 +
 +
===Git check version===
 +
<source lang="bash">#!/bin/bash
 +
 +
function set_upstream() {
 +
    echo "No upstream found, setting up branch to track "
 +
    exit
 +
}
 +
 +
function set_upstream() {
 +
    echo "No upstream found"
 +
}
 +
 +
 +
function check_latest_version(){
 +
    UPSTREAM=${1:-'@{u}'}
 +
   
 +
    if [ -z $(git for-each-ref --format='%(upstream:short)' $(git symbolic-ref -q HEAD)) ]; then
 +
        set_upstream
 +
    fi
 +
 +
    echo "Upstream: "$UPSTREAM
 +
    exit
 +
    # TODO: check if no upstream is configured, ask if should be automatically configured (git branch --set-upstream-to remotes/$TRACK_REPO/$TRACK_BRANCH)
 +
    # to get the upstream branch: git for-each-ref --format='%(upstream:short)' $(git symbolic-ref -q HEAD)
 +
 +
    LOCAL=$(git rev-parse @)
 +
    REMOTE=$(git rev-parse "$UPSTREAM")
 +
    BASE=$(git merge-base @ "$UPSTREAM")
 +
 +
    if [ ${LOCAL} = ${REMOTE} ]; then
 +
        status="Up-to-date"
 +
    elif [ ${LOCAL} = ${BASE} ]; then
 +
        status="Need-to-pull"
 +
    elif [ ${REMOTE} = ${BASE} ]; then
 +
        status="Need-to-push"
 +
    else
 +
        status="Diverged"
 +
    fi
 +
}
 +
check_latest_version</source>
 +
===Git check for updates and prompt to update===
 +
<source lang="bash">
 +
#!/bin/bash
 +
PROJECT_DIR="$HOME/cpc"
 +
PROJECT_PYTHON_INTERPRETER="$HOME/Virtualenvs/cpc/bin/python"
 +
TRACK_BRANCH="MacBookPablo"
 +
TRACK_REPO="origin"
 +
 +
 +
cd $PROJECT_DIR
 +
remote_commit=$(git branch -av | sed s/*/' '/g | grep $TRACK_BRANCH | grep $TRACK_REPO | awk '{print $2}')
 +
echo "Remote commit: $remote_commit"
 +
local_commit=$(git branch -av | sed s/*/' '/g | grep $TRACK_BRANCH | grep -v remotes/ | awk '{print $2}')
 +
echo "Local commit: $local_commit"
 +
 +
 +
django_migrate() {
 +
    $PROJECT_PYTHON_INTERPRETER manage.py migrate
 +
}
 +
 +
update() {
 +
    echo "Updating code"
 +
    git pull $TRACK_REPO, $TRACK_BRANCH
 +
    django_migrate
 +
}
 +
 +
 +
if [ "$remote_commit" = "$local_commit" ]; then
 +
    echo "Runing latest version"
 +
else
 +
    while true; do
 +
        read -p "Update available. Do you wish to update? " yn
 +
        case $yn in
 +
            [YySs]*) update; break;;
 +
            [Nn]* ) echo "Skipping update..." ; break;;
 +
            * ) echo "Choose y/n";;
 +
        esac
 +
    done
 +
fi
 +
 +
</source>
 +
 +
===Logging===
 +
 +
 +
For logging, you can wrap sections of your script in curly braces and redirect the stdout to a log file:
 +
<source lang="bash">
 +
{
 +
    script_command_1
 +
    script_command_2
 +
    script_command_3
 +
} >> /path/to/log_file
 +
</source>
 +
 +
===Links===
 +
[http://tldp.org/LDP/abs/html/ Advanced Bash-Scripting Guide]
Retrieved from "https://wiki.herrerosolis.com/index.php/Special:MobileDiff/139...2181"

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