有一次我做了一些有趣的项目，我仍然在使用它。它显示了一些动画，而我通过cp命令复制文件，因为cp没有显示任何内容，这有点令人沮丧。所以我取了这个别名

alias cp="~/SCR/spiner cp"

这是spiner脚本

#!/bin/bash

#Set timer
T=$(date +%s)

#Add some color
. ~/SCR/color

#Animation sprites
sprite=( "(* )  ( *)" " (* )( *) " " ( *)(* ) " "( *)  (* )" "(* )  ( *)" )

#Print empty line and hide cursor
printf "\n${COF}"

#Exit function
function bye { printf "${CON}"; [ -e /proc/$pid ] && kill -9 $pid; exit; }; trap bye INT

#Run our command and get its pid
"$@" & pid=$!

#Waiting animation
i=0; while [ -e /proc/$pid ]; do sleep 0.1

    printf "\r${GRN}Please wait... ${YLW}${sprite[$i]}${DEF}"
    ((i++)); [[ $i = ${#sprite[@]} ]] && i=0

done

#Print time and exit
T=$(($(date +%s)-$T))
printf "\n\nTime taken: $(date -u -d @${T} +'%T')\n"

bye

看起来像这样

循环动画）

这里是上面提到的彩色脚本的链接。和新的动画周期）

注意：如果这个想法不明显，除了别名之外，使用别名是一个坏主意，第一个是“别名中的函数”，第二个是“难以读取的重定向/源”。此外，还有一些缺陷（我认为这是显而易见的，但以防万一你会感到困惑：我并不是说它们真的可以在任何地方使用！）

我以前回答过这个问题，过去总是这样：

alias foo='__foo() { unset -f $0; echo "arg1 for foo=$1"; }; __foo()'

这是很好的，除非你避免一起使用函数。在这种情况下，您可以利用bash强大的重定向文本的能力：

alias bar='cat <<< '\''echo arg1 for bar=$1'\'' | source /dev/stdin'

它们的长度大致相同，只需几个字符即可。

真正的关键是时间差，顶部是“函数方法”，底部是“重定向源”方法。为了证明这一理论，时机不言自明：

arg1 for foo=FOOVALUE
 real 0m0.011s user 0m0.004s sys 0m0.008s  # <--time spent in foo
 real 0m0.000s user 0m0.000s sys 0m0.000s  # <--time spent in bar
arg1 for bar=BARVALUE
ubuntu@localhost /usr/bin# time foo FOOVALUE; time bar BARVALUE
arg1 for foo=FOOVALUE
 real 0m0.010s user 0m0.004s sys 0m0.004s
 real 0m0.000s user 0m0.000s sys 0m0.000s
arg1 for bar=BARVALUE
ubuntu@localhost /usr/bin# time foo FOOVALUE; time bar BARVALUE
arg1 for foo=FOOVALUE
 real 0m0.011s user 0m0.000s sys 0m0.012s
 real 0m0.000s user 0m0.000s sys 0m0.000s
arg1 for bar=BARVALUE
ubuntu@localhost /usr/bin# time foo FOOVALUE; time bar BARVALUE
arg1 for foo=FOOVALUE
 real 0m0.012s user 0m0.004s sys 0m0.004s
 real 0m0.000s user 0m0.000s sys 0m0.000s
arg1 for bar=BARVALUE
ubuntu@localhost /usr/bin# time foo FOOVALUE; time bar BARVALUE
arg1 for foo=FOOVALUE
 real 0m0.010s user 0m0.008s sys 0m0.004s
 real 0m0.000s user 0m0.000s sys 0m0.000s
arg1 for bar=BARVALUE

这是随机间隔进行的约200个结果的底部。函数创建/销毁似乎比重定向花费更多的时间。希望这将有助于未来的访问者解决这个问题（我不想对自己保密）。

以下是示例：

alias gcommit='function _f() { git add -A; git commit -m "$1"; } ; _f'

非常重要：

｛后和｛前有一个空格。有一个；依次在每个命令之后。如果您在最后一个命令后忘记了这一点，您将看到>提示符！参数用引号括起来，如“$1”

这是另一种使用read的方法。我使用这个方法通过名称片段对文件进行暴力搜索，忽略了“拒绝权限”消息。

alias loc0='( IFS= read -r x; find . -iname "*" -print 2>/dev/null | grep $x;) <<<'

一个简单的例子：

$ ( IFS= read -r x; echo "1 $x 2 ";) <<< "a b"
1 a b 2 

注意，这将参数作为字符串转换为变量。可以在引号中使用多个参数，以空格分隔：

$ ( read -r x0 x1; echo "1 ${x0} 2 ${x1} 3 ";) <<< "a b"
1 a 2 b 3 

下面是我的~/.bashrc中的三个函数示例，它们本质上是接受参数的别名：

#Utility required by all below functions.
#https://stackoverflow.com/questions/369758/how-to-trim-whitespace-from-bash-variable#comment21953456_3232433
alias trim="sed -e 's/^[[:space:]]*//g' -e 's/[[:space:]]*\$//g'"

.

:<<COMMENT
    Alias function for recursive deletion, with are-you-sure prompt.

    Example:
        srf /home/myusername/django_files/rest_tutorial/rest_venv/

    Parameter is required, and must be at least one non-whitespace character.

    Short description: Stored in SRF_DESC

    With the following setting, this is *not* added to the history:
        export HISTIGNORE="*rm -r*:srf *"
    - https://superuser.com/questions/232885/can-you-share-wisdom-on-using-histignore-in-bash

    See:
    - y/n prompt: https://stackoverflow.com/a/3232082/2736496
    - Alias w/param: https://stackoverflow.com/a/7131683/2736496
COMMENT
#SRF_DESC: For "aliaf" command (with an 'f'). Must end with a newline.
SRF_DESC="srf [path]: Recursive deletion, with y/n prompt\n"
srf()  {
    #Exit if no parameter is provided (if it's the empty string)
        param=$(echo "$1" | trim)
        echo "$param"
        if [ -z "$param" ]  #http://tldp.org/LDP/abs/html/comparison-ops.html
        then
          echo "Required parameter missing. Cancelled"; return
        fi

    #Actual line-breaks required in order to expand the variable.
    #- https://stackoverflow.com/a/4296147/2736496
    read -r -p "About to
    sudo rm -rf \"$param\"
Are you sure? [y/N] " response
    response=${response,,}    # tolower
    if [[ $response =~ ^(yes|y)$ ]]
    then
        sudo rm -rf "$param"
    else
        echo "Cancelled."
    fi
}

.

:<<COMMENT
    Delete item from history based on its line number. No prompt.

    Short description: Stored in HX_DESC

    Examples
        hx 112
        hx 3

    See:
    - https://unix.stackexchange.com/questions/57924/how-to-delete-commands-in-history-matching-a-given-string
COMMENT
#HX_DESC: For "aliaf" command (with an 'f'). Must end with a newline.
HX_DESC="hx [linenum]: Delete history item at line number\n"
hx()  {
    history -d "$1"
}

.

:<<COMMENT
    Deletes all lines from the history that match a search string, with a
    prompt. The history file is then reloaded into memory.

    Short description: Stored in HXF_DESC

    Examples
        hxf "rm -rf"
        hxf ^source

    Parameter is required, and must be at least one non-whitespace character.

    With the following setting, this is *not* added to the history:
        export HISTIGNORE="*hxf *"
    - https://superuser.com/questions/232885/can-you-share-wisdom-on-using-histignore-in-bash

    See:
    - https://unix.stackexchange.com/questions/57924/how-to-delete-commands-in-history-matching-a-given-string
COMMENT
#HXF_DESC: For "aliaf" command (with an 'f'). Must end with a newline.
HXF_DESC="hxf [searchterm]: Delete all history items matching search term, with y/n prompt\n"
hxf()  {
    #Exit if no parameter is provided (if it's the empty string)
        param=$(echo "$1" | trim)
        echo "$param"
        if [ -z "$param" ]  #http://tldp.org/LDP/abs/html/comparison-ops.html
        then
          echo "Required parameter missing. Cancelled"; return
        fi

    read -r -p "About to delete all items from history that match \"$param\". Are you sure? [y/N] " response
    response=${response,,}    # tolower
    if [[ $response =~ ^(yes|y)$ ]]
    then
        #Delete all matched items from the file, and duplicate it to a temp
        #location.
        grep -v "$param" "$HISTFILE" > /tmp/history

        #Clear all items in the current sessions history (in memory). This
        #empties out $HISTFILE.
        history -c

        #Overwrite the actual history file with the temp one.
        mv /tmp/history "$HISTFILE"

        #Now reload it.
        history -r "$HISTFILE"     #Alternative: exec bash
    else
        echo "Cancelled."
    fi
}

参考文献：

从字符串中删除空白：如何从Bash变量中删除空白？实际换行符：https://stackoverflow.com/a/4296147/2736496别名w/param：https://stackoverflow.com/a/7131683/2736496（这个问题的另一个答案）组氨酸：https://superuser.com/questions/232885/can-you-share-wisdom-on-using-histignore-in-bashY/N提示：https://stackoverflow.com/a/3232082/2736496从历史记录中删除所有匹配项：https://unix.stackexchange.com/questions/57924/how-to-delete-commands-in-history-matching-a-given-string字符串是否为空：http://tldp.org/LDP/abs/html/comparison-ops.html

函数和别名都可以使用其他函数和别名所示的参数。此外，我想指出几个其他方面：

1.函数在自己的作用域中运行，别名共享作用域

在需要隐藏或暴露某些内容的情况下，了解这种差异可能很有用。它还表明，函数是封装的更好选择。

function tfunc(){
    GlobalFromFunc="Global From Func" # Function set global variable by default
    local FromFunc="onetwothree from func" # Set a local variable

}

alias talias='local LocalFromAlias="Local from Alias";  GlobalFromAlias="Global From Alias" # Cant hide a variable with local here '
# Test variables set by tfunc
tfunc # call tfunc
echo $GlobalFromFunc # This is visible
echo $LocalFromFunc # This is not visible
# Test variables set by talias
# call talias
talias
echo $GlobalFromAlias # This is invisible
echo $LocalFromAlias # This variable is unset and unusable 

输出：

bash-3.2$     # Test variables set by tfunc
bash-3.2$     tfunc # call tfunc
bash-3.2$     echo $GlobalFromFunc # This is visible
Global From Func
bash-3.2$     echo $LocalFromFunc # This is not visible

bash-3.2$     # Test variables set by talias
bash-3.2$     # call talias
bash-3.2$     talias
bash: local: can only be used in a function
bash-3.2$     echo $GlobalFromAlias # This is invisible
Global From Alias
bash-3.2$ echo $LocalFromAlias # This variable is unset and unusable

2.包装脚本是更好的选择

在我身上发生过几次，当通过ssh登录或涉及切换用户名或多用户环境时，找不到别名或函数。源点文件有一些提示和技巧，或者这个有趣的别名：aliassd='sudo'让这个后续的别名aliasinstall='sd-apt-get-install'按预期工作（注意sd='udo'中的额外空间）。然而，在这种情况下，包装脚本比函数或别名更有效。包装器脚本的主要优点是它在预期路径（即/usr/loca/bin/）下是可见的/可执行的，其中作为函数/别名需要在其可用之前获取。例如，您将一个函数放在~/.bash_profile或~/.bahrc中用于bash，但稍后切换到另一个shell（即zsh），则该函数不再可见。因此，当您有疑问时，包装脚本始终是最可靠和可移植的解决方案。