I'm just getting into bash and sh scripting.  I mostly just stub out little convenience or exercise scripts for myself, but I recognize I may be flaunting best practices at times.My question is specifically related to best practices (or just common sense) when using rm inside a shell script.  My googles have only turned up suggestions to alias rm to rm -i or somesuch.Anyway, enough talk, here's the script (note: the rm appears at the very end of the script):#!/bin/sh -e# Format output of alias print dump into more readable formatif [ -f TEMP.AWK ]; then    echo Somehow 'TEMP.AWK' already exists    exit 1ficat ${HOME}/.zshrc | grep -e '^alias' | awk -F'=' 'BEGIN {        print ALIAS                         | COMMAND;        print ---------------------------------------;    }    {        # replace all multi-spaces with a single space        gsub(/\s+/,  , $0);        col1Len  = 20;        col2Len  = 60;        aliasLen = length($1);        cmdLen   = length($2);        tab1len  = col1Len - aliasLen;        tab2len  = col2Len - cmdLen;        printf   $1          for (i = 0; i < tab1len; i++)            printf -        print   $2    } END {        print ---------------------------------------;    }' > TEMP.AWKcat TEMP.AWK | grep --color -e '[#].*'rm TEMP.AWKAny other feedback would not go unappreciated.
Displaying a table of shell aliases
console;shell;sh
The best practice for dealing with temporary files is simply not to use them in the first place.  Many things can go wrong with temporary files:Lack of permissions to write to a directoryLack of disk spaceRead-only filesystemFile or symlink already existsFile or symlink didn't exist when you checked, but got created immediately after, in a race conditionScript crashed, such that it created a temporary file but didn't get a chance to clean it upThough there are ways to mitigate these risks, I see no reason to use a temporary file here at all.  For that matter, cat and the first grep are also superfluous.#!/bin/shawk -F= '    BEGIN {        TABLE_FMT = %-18s | %-58s        row = sprintf(TABLE_FMT, ALIAS, COMMAND);        print row;        gsub(., -, row);        print row;    }    END {        print row;    }    /^alias/ {        gsub(/\s+/,  , $0);  # Condense consecutive whitespace        printf TABLE_FMT \n, $1, $2;    }' < $HOME/.zshrc | grep --color '#.*\|$'I can't tell for sure, but it looks like the second grep is meant to highlight comments.  Unfortunately, it actually ends up stripping out all uncommented lines, including the header and footer.Instead of parsing the $HOME/.zshrc configuration file, you might want to query the live alias definitions in the current shell instead.  In that case, you should write a shell function that processes the output of the bare alias command.