In /usr/bin/fig2ps2tex line 27:
bbox=`grep "^%%BoundingBox:" $1`
     ^-------------------------^ SC2006: Use $(...) notation instead of legacy backticked `...`.
                             ^-- SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
bbox=$(grep "^%%BoundingBox:" "$1")


In /usr/bin/fig2ps2tex line 29:
bbox2=`echo $bbox | awk '{print $2}'`
      ^-----------------------------^ SC2006: Use $(...) notation instead of legacy backticked `...`.
            ^---^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
bbox2=$(echo "$bbox" | awk '{print $2}')


In /usr/bin/fig2ps2tex line 30:
bbox3=`echo $bbox | awk '{print $3}'`
      ^-----------------------------^ SC2006: Use $(...) notation instead of legacy backticked `...`.
            ^---^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
bbox3=$(echo "$bbox" | awk '{print $3}')


In /usr/bin/fig2ps2tex line 31:
bbox4=`echo $bbox | awk '{print $4}'`
      ^-----------------------------^ SC2006: Use $(...) notation instead of legacy backticked `...`.
            ^---^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
bbox4=$(echo "$bbox" | awk '{print $4}')


In /usr/bin/fig2ps2tex line 32:
bbox5=`echo $bbox | awk '{print $5}'`
      ^-----------------------------^ SC2006: Use $(...) notation instead of legacy backticked `...`.
            ^---^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
bbox5=$(echo "$bbox" | awk '{print $5}')


In /usr/bin/fig2ps2tex line 34:
xsp=`echo "scale=3; ( $bbox4 - $bbox2 ) / 72" | bc`
    ^-- SC2006: Use $(...) notation instead of legacy backticked `...`.

Did you mean: 
xsp=$(echo "scale=3; ( $bbox4 - $bbox2 ) / 72" | bc)


In /usr/bin/fig2ps2tex line 35:
ysp=`echo "scale=3; ( $bbox5 - $bbox3 ) / 72" | bc`
    ^-- SC2006: Use $(...) notation instead of legacy backticked `...`.

Did you mean: 
ysp=$(echo "scale=3; ( $bbox5 - $bbox3 ) / 72" | bc)

For more information:
  https://www.shellcheck.net/wiki/SC2086 -- Double quote to prevent globbing ...
  https://www.shellcheck.net/wiki/SC2006 -- Use $(...) notation instead of le...