sed处理文件中dosCR/LF-创新互联

 将dos控制字符^M替换掉;

 # IN unix ENVIRONMENT: convert DOS newlines (CR/LF) to Unix format)
    sed 's/^M$//'             # in bash/tcsh, press Ctrl-V then Ctrl-M
    sed 's/.$//'              # assumes that all lines end with CR/LF
    sed 's/\x0D$//'           # gsed 3.02.80, but top script is easier

 # IN UNIX ENVIRONMENT: convert Unix newlines (LF) to DOS format
    sed "s/$/`echo -e \\\r`/" # command line under ksh
    sed 's/$'"/`echo \\\r`/"  # command line under bash
    sed "s/$/`echo \\\r`/"    # command line under zsh
    sed 's/$/\r/'             # gsed 3.02.80

 # IN DOS ENVIRONMENT: convert Unix newlines (LF) to DOS format
    sed "s/$//"               # method 1
    sed -n p                  # method 2

 # IN DOS ENVIRONMENT: convert DOS newlines (CR/LF) to Unix format
 # Cannot be done with DOS versions of sed. Use "tr" instead.
    tr -d \r outfile # GNU tr version 1.22 or higher

Example:删除文件中的所有空行和由空格组成的行;
$cat ifile|sed '/^$/d'|sed '/^[[:space:]]*$/d'   # method 1
$cat ifile|sed -e '/^$/d' -e '/^[[:space:]]*$/d' # method 2

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