Linux World: December 2020

Here is a bash script which can be used to create the text 2021 on the terminal using any characher of your choice.

#!/bin/bash

#create 2021 on terminal using any user specified character
str_dwn() {
rows=$1
s_start=$2
char=$4
str_st_row=$3
rows_end=$((str_st_row+rows))
for((i=str_st_row;i<rows_end;i++))
do 
tput cup $i $s_start
printf "$char " 
done
echo""
}

backslash() {
b_st_row=$1
b_st_cols=$2
b_char=$3
b_r_end=$((b_st_row + 5 ))
for((p=b_st_row;p<b_r_end;p++))
do 
tput setaf $4
tput cup $p $b_st_cols
printf "$b_char " 
((b_st_cols++))
done
echo""
}

forward() {
f_st_row=$1
f_st_cols=$2
f_len=$3
f_char=$4

f_r_end=$((f_st_row + $f_len))

for((i=f_st_row;i<f_r_end;i++))
do 
tput cup $i $f_st_cols
printf "$f_char "
 ((f_st_cols--))
done
echo""

}

horizontal() {
hrow=$2
hstart=$1
hcols=$3
char=$4

end=$((hstart + hcols))

for((i=hstart;i<=end;i++))
do 
tput cup $hrow $i
printf "$char" 
done
echo""
}

half_horizontal() {
hrow=$2
hstart=$1
hcols=$(($3/2))
char=$4

end=$((hstart + hcols))

for((i=hstart;i<=end;i++))
do 
tput cup $hrow $i
printf "$char" 
done
echo""
}

gen_rand() {
num1=$1

if [ $num1 -eq 0 ]
then
temp=$(($RANDOM % 2))
rand=$((temp + 2))

else

temp=$(($RANDOM % 5))
rand=$((temp + num1))
fi
}

two() {

hstart_2=$1
hrow_be=$2
hcols_2=$3
char=$4
color=$5

set_color

horizontal $hstart_2 $hrow_be $hcols_2 "$char"

st_row_2=$((hrow_be+1))
f_st_cols_2=$((hstart_2+hcols_2))

forward $st_row_2 $f_st_cols_2 5 "$char" $color
hstart_2_lo=$start
hrow_2_lo=$((hrow_be+6))
hcols_2_lo=5
horizontal $hstart_2_lo $hrow_2_lo $hcols_2_lo "$char"

}

zero() {

set_color

hstart_0=$((f_st_cols_2 +4))
hcols_0=5
horizontal $hstart_0 $hrow_be $hcols_0 "$char"

str_dwn_col_0=$hstart_0
str_dwn_row_0=$((hrow_be + 1))
str_dwn 6 $str_dwn_col_0 $str_dwn_row_0 "$char"

hstart_0_lo=$((f_st_cols_2 +4))
hcols_0_lo=6
hrow_0_lo=$((hrow_be+6))
horizontal $hstart_0 $hrow_0_lo $hcols_0 "$char"

str_dwn_col_rig_0=$((hstart_0 +5))
str_dwn_row_rig_0=$((hrow_be + 1))
str_dwn 6 $str_dwn_col_rig_0 $str_dwn_row_rig_0 "$char"
}

twoo() {
set_color

set_color

##############################
hstart_2=$((str_dwn_col_rig_0 +2))
hcols_2=6
horizontal $hstart_2 $hrow_be $hcols_2 "$char" 
###############################################
st_row_2=$((hrow_be+1))
f_st_cols_2=$((hstart_2+hcols_2))

forward $st_row_2 $f_st_cols_2 5 "$char" $color
######################################################
hstart_2_lo=$hstart_2
hrow_2_lo=$((hrow_be+6))
hcols_2_lo=5
horizontal $hstart_2_lo $hrow_2_lo $hcols_2_lo "$char" 
}

one() {
set_color
str_dwn_col_1=$((hstart_2 + 8))
str_dwn_row_1=$((hrow_be))
str_dwn 7 $str_dwn_col_1 $str_dwn_row_1 "$char"

}

five() {
set_color

set_color

#hstart_8=$((str_dwn_col_1 +4))
#hcols_8=5
#horizontal $hstart_8 $hrow_be $hcols_8 "$char"

str_dwn_col_8=$hstart_8
str_dwn_row_8=$((hrow_be + 1))
str_dwn 3 $str_dwn_col_8 $str_dwn_row_8 "$char"

hstart_8_lo=$((f_st_cols_2 +4))
hcols_8_lo=6
hrow_8_lo=$((hrow_be+6))
horizontal $hstart_8 $hrow_8_lo $hcols_8 "$char"

str_dwn_col_rig_8=$((hstart_8 +5))
str_dwn_row_rig_8=$((hrow_be + 1))
str_dwn 6 $str_dwn_col_rig_8 $str_dwn_row_rig_8 "$char"

hstart_8_lo=$((f_st_cols_2 +4))
hcols_8_lo=6
hrow_8_lo=$((hrow_be+3))
horizontal $hstart_8 $hrow_8_lo $hcols_8 "$char"

}

set_color(){
color=$RANDOM 
color=$((color%6))
tput setaf $color
}

cols=`tput cols`
mid=$((cols/2))
start=$((mid-16))
echo "What character do you want to use"
read char
#char="*"

tput clear
rows=5

begin_row=2
num_cols=6

two $start $begin_row $num_cols "$char" $color;zero;twoo;one

tput setaf 7
tput cup 9 0

Copy the script and save it as 2021.sh. Open a terminal and type

It will prompt for the characher which should be used. We have entered "*" as the characher, and you should see the output as shown below.

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2021 on Linux Terminal

Extracting images from a PDF

Package inputenc Error: Unicode character Σ (U+03A3) (inputenc) not set up for use with LaTeX.