# bashclip

Bash clipboard of snippets

# Merge Lines 2-by-2
```bash
sed '$!N;s/\n/ /' infile
```

# Temporary files
```bash
BASE=$(basename $0 .sh)
TEMPHTML="$BASE.html"
TEMPTXT="$BASE.txt"
TEMPJSON="$BASE.json"
TEMPCOOKIE="$BASE.cookie"
TEMPCSV="$BASE.csv"
```

# Clean Exit
```bash
function clean_temp_files()
{
  rm -f $TEMPHTML $TEMPJSON $TEMPCOOKIE $TEMPCSV
}
trap clean_temp_files EXIT
```
# Die
```bash
function die()
{
  RETCODE=$1
  if [ "" == "$1" ]
  then
    RETCODE=255
  fi
  echo " FAILED"
  exit $RETCODE
}
```

# Minimal RC Management
```bash
RCFILE="$HOME/.rcfile"

function readrc()
{
  echo "+- Reading credentials from $RCFILE"
  USER=$(grep "user=" $RCFILE | awk -F'=' '{print $2}')
  PASSWD=$(grep "password=" $RCFILE | awk -F'=' '{print $2}')  
}

if [ ! -e $RCFILE ]
then
  echo "+- Credentials file does not exist"
  read -e -p "   +- Username      : " TEMP
  USER=$TEMP
  TEMP=""
  read -e -s -p "   +- Password      : " TEMP
  PASSWD=$TEMP

  # Make the file unreadable by others *BEFORE* putting password.
  touch $RCFILE
  chmod go-r $RCFILE

  echo "user=$USER">$RCFILE
  echo "password=$PASSWD" >> $RCFILE
  echo ""
else
  readrc                                                                                                                                                                                                       
fi
```

# Logging
```bash
LOG_ENABLED=1
LOGFILE="<path>/to.log"
function log() {
  if [ 1 -eq $LOG_ENABLED ]
  then
    DATELOG=$(date)
    echo -e "$@"
    echo -e "$DATELOG $(hostname) $(basename $0): $@" >> $LOGFILE
  fi
}

DATE_START_ALL=$(date +%s)
log "############################################################"
log "Started @ $DATE_START_ALL"
```

# URLencode
```bash
rawurlencode() {
  local string="${1}"
  local strlen=${#string}
  local encoded=""
  local pos c o

  for (( pos=0 ; pos<strlen ; pos++ )); do
     c=${string:$pos:1}
     case "$c" in
        [-_.~a-zA-Z0-9] ) o="${c}" ;;
        * )               printf -v o '%%%02x' "'$c"
     esac
     encoded+="${o}"
  done
  echo "${encoded}"    # You can either set a return variable (FASTER)
  REPLY="${encoded}"   #+or echo the result (EASIER)... or both... :p
}
args=$1

echo http://url/q?=$(rawurlencode "$args")
```
Output example :
```bash
$ ./toto.sh "toto@gmail.com&truc=bidule&c=0x1234&tutu=%3"
http://url/q?=toto%40gmail.com%26truc%3dbidule%26c%3d0x1234%26tutu%3d%253
```

# URLdecode
```bash
urldecode() {
    # urldecode <string>

    local url_encoded="${1//+/ }"
    printf '%b' "${url_encoded//%/\\x}"
}
```

# Zeroing a file
```bash
: > filename
```

# List of Opened Socket without netstat
```bash
lsof -i4 -n
```

# Colors in scripts
use with **echo -e**

```bash
GREEN="\\033[1;32m"
RED="\\033[1;31m"
MAGENTA="\\033[1;35m"
BLUE="\\033[1;34m"
WHITE="\\033[0;02m"
LIGHTGREY="\\033[1;08m"
YELLOW="\\033[1;33m"
CYAN="\\033[1;36m"
NORMAL="\\033[0;39m"
```

# Replace a key=value in a file
With **infile** being:

```ini
[section]
  key=value
  key2=value2
```



```
sed -i "s/key=.*/key=NEW/" infile
```
In a section

```
sed -i '/^\[section\]/{$!{N;s/key=.*/key=NewMULTILINE/;ty;P;P;:y}}' infile
```

# Extract value from an ini file
Warning: iworks only for first key after [section]
```
sed -nr '/\[section\]/ { :l /^[ |\t]*key[ |\t]*=/ { s/.*=[ ]*//; p; q;}; n; b l;}'
```

# Match several times the same key=value
```bash
awk 'match($0, /ID>(TWA[^ ]+AS)<\/ID>/, asid){if(match($0, /Strategy="([^ ]+)">/, strategy)){print asid[1], strategy[1]}}' *.AS
```

OR

```bash
grep -Pio 'Strategy="\K[^"]*' 
```

# Network interface details

## MAC Address

```bash
cat /sys/class/net/eth0/address
```

## Link status 

- Integer

```bash
cat /sys/class/net/eth0/carrier
```

- String

```bash
cat /sys/class/net/eth0/operstate
```