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im having trouble with the comprehending the exec command and the use of file descriptors.
given:

#!/bin/sh

exec 4>&1
exec 1>&2
exec 2>&4
exec 4>&-

echo Hello

would the standard...

Below is a description of what im trying to achieve:

Write a shell script to concatenate lists together, and output the resulting list. Do not include any argument that is a sub-list of the entire...

I need help following this script:

#!/bin/sh
file=$1
shift
vi `grep -l "$file" "$@"`

when i run it i get nothing. does the 'shift' before the 'vi' command
remove the value of $1, thereby...

im trying to find a command to
change all upper case to lower case and
all lower case to upper case.
for example:
file is 'RED sox'
need it changed to 'red SOX'

tried tr 'a-zA-Z' 'A-Za-z'...