我曾经使用CShell(csh),它允许您创建一个接受参数的别名。符号有点像

alias junk="mv \\!* ~/.Trash"

在巴什,这似乎行不通。鉴于Bash有许多有用的特性,我会假设这一特性已经实现,但我想知道如何实现。


当前回答

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

其他回答

alias junk="delay-arguments mv _ ~/.Trash"

延迟参数脚本:

#!/bin/bash

# Example:
# > delay-arguments echo 1 _ 3 4 2
# 1 2 3 4
# > delay-arguments echo "| o n e" _ "| t h r e e" "| f o u r" "| t w o"
# | o n e | t w o | t h r e e | f o u r

RAW_ARGS=("$@")

ARGS=()

ARG_DELAY_MARKER="_"
SKIPPED_ARGS=0
SKIPPED_ARG_NUM=0
RAW_ARGS_COUNT="$#"

for ARG in "$@"; do
  #echo $ARG
  if [[ "$ARG" == "$ARG_DELAY_MARKER" ]]; then
    SKIPPED_ARGS=$((SKIPPED_ARGS+1))
  fi
done

for ((I=0; I<$RAW_ARGS_COUNT-$SKIPPED_ARGS; I++)); do
  ARG="${RAW_ARGS[$I]}"
  if [[ "$ARG" == "$ARG_DELAY_MARKER" ]]; then
    MOVE_SOURCE_ARG_NUM=$(($RAW_ARGS_COUNT-$SKIPPED_ARGS+$SKIPPED_ARG_NUM))
    MOVING_ARG="${RAW_ARGS[$MOVE_SOURCE_ARG_NUM]}"
    if [[ "$MOVING_ARG" == "$ARG_DELAY_MARKER" ]]; then
      echo "Error: Not enough arguments!"
      exit 1;
    fi
    #echo "Moving arg: $MOVING_ARG"
    ARGS+=("$MOVING_ARG")
    SKIPPED_ARG_NUM=$(($SKIPPED_ARG_NUM+1))
  else
    ARGS+=("$ARG")
  fi
done

#for ARG in "${ARGS[@]}"; do
  #echo "ARGN: $ARG"
#done

#echo "RAW_ARGS_COUNT: $RAW_ARGS_COUNT"
#echo "SKIPPED_ARGS: $SKIPPED_ARGS"

#echo "${ARGS[@]}"
QUOTED_ARGS=$(printf ' %q' "${ARGS[@]}")
eval "${QUOTED_ARGS[@]}"

另一种解决方案是使用标记,这是我最近创建的一个工具,它允许您将命令模板“书签”,并轻松地将光标放置在命令占位符处:

我发现,大多数时候,我都在使用shell函数,所以我不必在命令行中一次又一次地编写常用命令。在这个用例中使用函数的问题是在我的命令词汇表中添加新的术语,并且必须记住实际命令中的函数参数。标记目标是消除这种心理负担。

Bash别名不直接接受参数。您必须创建一个函数。

alias不接受参数,但可以像别名一样调用函数。例如:

myfunction() {
    #do things with parameters like $1 such as
    mv "$1" "$1.bak"
    cp "$2" "$1"
}


myfunction old.conf new.conf #calls `myfunction`

顺便说一句,.bashrc和其他文件中定义的Bash函数可以作为shell中的命令使用。例如,您可以这样调用前面的函数

$ myfunction original.conf my.conf

语法:

alias shortName="your custom command here"

例子:

alias tlogs='_t_logs() { tail -f ../path/$1/to/project/logs.txt ;}; _t_logs'

完善上面的答案,您可以获得与别名类似的单行语法,这对于shell或.bashrc文件中的特殊定义更为方便:

bash$ myfunction() { mv "$1" "$1.bak" && cp -i "$2" "$1"; }

bash$ myfunction original.conf my.conf

不要忘记右右括号前的分号。同样,对于实际问题:

csh% alias junk="mv \\!* ~/.Trash"

bash$ junk() { mv "$@" ~/.Trash/; }

Or:

bash$ junk() { for item in "$@" ; do echo "Trashing: $item" ; mv "$item" ~/.Trash/; done; }