带sed和随机数的Shell脚本

Question

How to make a shell script that receives one or more text files and removes from them whitespaces and blanklines. After that new files will have a random 2-digit number in front of them.
For example File1.txt generates File1_56.txt

Tried this:

#!/bin/bash
for file in "$*"; do
sed -e '/^$/d;s/[[:blank:]]//g' $* >> "$*_$$.txt"
done 

But when I give 2 files as input script merges them into one single file, when I want for each file a separate one.

Answer 1

Try:

#!/bin/bash
for file in "$@"; do
    sed -e '/^$/d;s/[[:blank:]]//g' "$file" >> "${file%.txt}_$$.txt"
done 

Notes

1. To loop over each argument without word splitting or other hazards, use for file in "$@" not for file in "$*"

2. To run the sed command on one file instead of all, specify "$file" as the file, not $* .

3. To save the output to the correct file, use "${file%.txt}_$$.txt" where ${file%.txt} is an example of suffix removal : it removes the final .txt from the file name.

4. $$ is the process ID. The title says mentions a "random" number. If you want a random number, replace $$ with $RANDOM .