File Manipulation

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Counting the number of files in a directory and all sub-directories: 

ls -laR | wc -l

Removing the first few characters from a file name ('old' in this case): 

for x in old*.pdf; do echo `basename $x` | sed -e 's/...//' ; done
for x in old*.pdf; do y=`echo \`basename $x\` | sed -e 's/...//'`; echo $x $y; done
for x in old*.pdf; do y=`echo $x | sed -e 's/...//'`; echo $x $y; done
for x in old*.pdf; do y=`echo $x | sed -e 's/...//'`; mv $x $y; done

Adding characters to a file name whilst preserving the correct file extension: 

for x in *.pdf; do y=`basename $x .pdf`; mv $x ${y}_map.pdf; done
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