shell数组使用

论坛里的一个兄弟要同时折腾两个变量,不知道如何折腾. 后来了解到可以用数组
都忘记shell还有数组了.

写了一个测试程序. 记录一下. 以后也有个印象.

#!/bin/bash

declare -a tmp

for i in $(find /bin -type f)
do
let c++
tmp[c]="$i"
done

len="${#tmp[@]}"  #array length

c=len
for i in $(find /usr/bin -type f)
do
let c++
tmp[c]="$i"
done

i=0
while [ $i -le $len ]
do
let i+=1
echo "BIN:${tmp[i]}; USR:${tmp[i+len]}"
done

$ bash a.sh
BIN:/bin/cp USR:/usr/bin/semodule_link
BIN:/bin/redhat_lsb_init USR:/usr/bin/gst-launch
BIN:/bin/readlink USR:/usr/bin/opgprof
BIN:/bin/unicode_start USR:/usr/bin/eu-strings
BIN:/bin/ps USR:/usr/bin/pango-querymodules-64
BIN:/bin/lsblk USR:/usr/bin/w
BIN:/bin/sleep USR:/usr/bin/smbta-util
BIN:/bin/setserial USR:/usr/bin/aserver
BIN:/bin/unicode_stop USR:/usr/bin/patch
BIN:/bin/cgget USR:/usr/bin/pdftops
BIN:/bin/nano USR:/usr/bin/lzmainfo
BIN:/bin/cgdelete USR:/usr/bin/gstack
BIN:/bin/ln USR:/usr/bin/rngtest
BIN:/bin/mkdir USR:/usr/bin/nfs4_setfacl
BIN:/bin/mknod USR:/usr/bin/vimtutor
BIN:/bin/dumpkeys USR:/usr/bin/op-check-perfevents
BIN:/bin/ipcalc USR:/usr/bin/sedispol
BIN:/bin/gzip USR:/usr/bin/reporter-mailx
BIN:/bin/true USR:/usr/bin/tiff2pdf
BIN:/bin/mv USR:/usr/bin/urlgrabber
BIN:/bin/dbus-uuidgen USR:/usr/bin/groffer
BIN:/bin/cgsnapshot USR:/usr/bin/smbcquotas
BIN:/bin/env USR:/usr/bin/nfs4_getfacl
BIN:/bin/arch USR:/usr/bin/repomanage
BIN:/bin/echo USR:/usr/bin/eu-unstrip
BIN:/bin/touch USR:/usr/bin/.ssh.hmac

脚本取第一次的结果长度为后面while的最大长度.

数组还可以直接

for i in ${array[@]}; do ... ; done

但要同时取两个变量就不好折腾了.

另外数组还有分片, 替换等高级功能, 这个目前没用到. 不写了.

还是折腾python为主...

附, 那边论坛版主的脚本. 使用三目运算等等, 更加简洁

#!/bin/bash

bin=( $(find /bin -type f) )
ubin=( $(find /usr/bin -type f) )

(( len = ${#bin[@]} < ${#ubin[@]} ? ${#bin[@]} : ${#ubin[@]} ))

for (( i = 0; i < len; i++ )); do
echo "/bin: ${bin[$i]}"
echo "/usr/bin: ${ubin[$i]}"
done