如何将数字数组从bash传递给csh

Question

首先,在我的辩护中:我只使用csh,因为我的团队有很多遗留的csh.我们做科学编程; 很多人显然学会了在SunOS/Solaris时代使用csh,并且尽管有linux/bash过渡,但并没有放弃,尽管后者的(IMHO明显)优势.其次,如果这是一个FAQ,请道歉,但我没有通过SO或谷歌搜索找到答案,我已经投入了一些努力.

话虽如此:

我想从bash驱动一些遗留的csh脚本,作为[重写,删除]后者的第一步.bash-> csh适用于标量环境变量('envvars'),因为我可以从bash中导出它们并按预期从csh中读取它们.

然而,不是阵列...... 直到Chris J. Kiick的回答如下!以下示例更新为包括Kiick的答案及其产生的结果.将以下2个文件放在同一目录中,...

array_writer.sh

#!/usr/bin/env bash
### Test writing an array, passing it to csh, and reading it there.

THIS="$0"
THIS_DIR="$(readlink -f $(dirname ${THIS}))"
THIS_FN="$(basename ${THIS})"
MESSAGE_PREFIX="${THIS_FN}:"
ERROR_PREFIX="${MESSAGE_PREFIX} ERROR:"

PARTNER_FN='array_reader.csh'
PARTNER_DIR="${THIS_DIR}"
PARTNER_FP="${PARTNER_DIR}/${PARTNER_FN}"

export YEAR='2007'
# month-related arrays for ${YEAR}
declare -a BDOM=(0 31 59 90 120 151 181 212 243 273 304 334) # 0-based-Julian of first day of each month
declare -a MDAY=(31 28 31 30 31 30 31 31 30 31 30 31) # days in each month, length=12

echo -e "${MESSAGE_PREFIX} YEAR='${YEAR}':"
# start debugging
# use subshell for IFS
( IFS=',' ; echo -e "\tBDOM=${BDOM[*]}" )
( IFS=',' ; echo -e "\tMDAY=${MDAY[*]}" )
#   end debugging

### Direct export of arrays fails, but this works!
### Note it actually exports a string: see handling in partner
echo -e "${MESSAGE_PREFIX} about to call ${PARTNER_FP}:\n"
# from https://stackoverflow.com/a/20625229/915044
bdom=${BDOM[*]} mday=${MDAY[*]} ${PARTNER_FP}
if [[ $? -ne 0 ]] ; then
  echo -e "\n${ERROR_PREFIX} failed or not found\n"
else
  echo -e "\n${MESSAGE_PREFIX} ${PARTNER_FP} returned successfully"
fi

array_reader.csh

#!/bin/csh -f
### Test reading an array written from bash.

set THIS="$0"
# set THISDIR="$(readlink -f $(dirname ${THIS}))" # fails!
set THIS_DIRNAME=`dirname ${THIS}`
set THIS_DIR=`readlink -f ${THIS_DIRNAME}`
set THIS_FN=`basename ${THIS}`
set MESSAGE_PREFIX="${THIS_FN}:"
set ERROR_PREFIX="${MESSAGE_PREFIX} ERROR:"

if ( $?bdom ) then
  # Gotta convert passed string into a "real" csh array
  set bdom_array = ( $bdom )
  echo ${MESSAGE_PREFIX} found export=bdom, size=$#bdom_array":"
  printf "\t"          # continue on same line
  foreach item ( $bdom_array )
    printf "%d," $item # ditto
  end
  echo "" # newline to end the array-printing line
else
  echo "${ERROR_PREFIX} no export=bdom"
  exit 2
endif

echo "" # separate reports

if ( $?mday ) then
  set mday_array = ( $mday )
  echo ${MESSAGE_PREFIX} found export=mday, size=$#mday_array":"
  printf "\t"
  foreach item ( $mday_array )
    printf "%d," $item
  end
  echo "" # newline to end the array-printing line
else
  echo "${ERROR_PREFIX} no export=mday"
  exit 3
endif

exit 0

...然后,从你的shell,做...

$ /path/to/array_writer.sh
array_writer.sh: YEAR='2007':
        BDOM=0,31,59,90,120,151,181,212,243,273,304,334
        MDAY=31,28,31,30,31,30,31,31,30,31,30,31
array_writer.sh: about to call /path/to/array_reader.csh:

array_reader.csh: found export=bdom, size=12:
        0,31,59,90,120,151,181,212,243,273,304,334,

array_reader.csh: found export=mday, size=12:
        31,28,31,30,31,30,31,31,30,31,30,31,

array_writer.sh: /path/to/array_reader.csh returned successfully

Answer 1

我不熟悉 csh 中的数组，但导出似乎很容易：

在bash中：

bdom=${BDOM[*]} mday=${MDAY[*]} ${PARTNER_FP}

你不需要“env”命令，bash 已经内置了该命令。

要将 $bdom 变成单词列表，而不是单个字符串，请使用 ()。在 csh 中：

set bdom_array = ( $bdom )