我正在创建一个在OS X上运行的脚本,该脚本将由新手用户经常运行,因此希望通过每次创建一个新的目录结构来保护目录结构,最后使用n + 1:
target001
下一次创建target002
我到目前为止:
lastDir=$(find /tmp/target* | tail -1 | cut -c 6-)
let n=$n+1
mkdir "$lastDir""$n"
然而,数学在这里不起作用。
答案 0 :(得分:2)
怎么样?
mktemp
?
Create a temporary file or directory, safely, and print its name. TEMPLATE must contain at least 3 consecutive `X's in last component. If TEMPLATE is not specified, use tmp.XXXXXXXXXX, and --tmpdir is implied. Files are created u+rw, and directories u+rwx, minus umask restrictions.
答案 1 :(得分:2)
使用此行计算新序列号:
...
n=$(printf "%03d" $(( 10#$n + 1 )) )
mkdir "$lastDir""$n"
10#强制基地10 arithmetic。已经提供了$ n最后的保证金,例如“001”。
答案 2 :(得分:1)
没有管道和子流程:
targets=( /tmp/target* ) # all dirs in an array
lastdir=${targets[@]: (-1):1} # select filename from last array element
lastdir=${lastdir##*/} # remove path
lastnumber=${lastdir/target/} # remove 'target'
lastnumber=00$(( 10#$lastnumber + 1 )) # increment number (base 10), add leading zeros
mkdir /tmp/target${lastnumber: -3} # make dir; last 3 chars from lastnumber
包含2个参数的版本:
path='/tmp/x/y/z' # path without last part
basename='target' # last part
targets=( $path/${basename}* ) # all dirs in an array
lastdir=${targets[@]: (-1):1} # select path from last entry
lastdir=${lastdir##*/} # select filename
lastnumber=${lastdir/$basename/} # remove 'target'
lastnumber=00$(( 10#$lastnumber + 1 )) # increment number (base 10), add leading zeros
mkdir $path/$basename${lastnumber: -3} # make dir; last 3 chars from lastnumber
答案 3 :(得分:1)
使用扩展测试的完整解决方案[[和BASH_REMATCH:
[[ $(find /tmp/target* | tail -1) =~ ^(.*)([0-9]{3})$ ]]
mkdir $(printf "${BASH_REMATCH[1]}%03d" $(( 10#${BASH_REMATCH[2]} + 1 )) )
提供/ tmp / target001是您的目录模式。
答案 4 :(得分:0)
像这样:
lastDir=$(find /tmp/target* | tail -1)
let n=1+${lastDir##/tmp/target}
mkdir /tmp/target$(printf "%03d" $n)