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cat 1
1
2
3
[cailu@host26 ~]$ cat 2
a
b
c
[cailu@host26 ~]$ while read -u3 A && read -u4 B;do echo $A;echo $B;done 3<1 4<2
1
a
2
b
3
c

awk '/IP/{P=$NF;i=1};i&&/#User/{print $2"@"P;i=0}' filename
xxxxxxxxx@11.11.11.11
yyyyyyyyyyyyy@11.11.11.22

[root@~]# bash array.sh
2 4 6
[root@~]# cat array.sh
#!/bin/bash
b=(1 2 3)
a=0
for i in ${b[@]}
do
narray[${a}]=$((${b[$a]}*2))
((a++))
done
echo ${narray[@]}

Test...

sed '$d' file

Test environment ： centos 5.5

[root@dist unix]# cat file
Record 1:
::::::::::::::::::::::
::::::::::::::::::::::
ID "000001"
::::::::::::::::::::::
::::::::::::::::::::::
Record 2:
::::::::::::::::::::::...

[root@dist unix]# sed 's/../&:/g;s/://7g' file
21:00:00:12:34:34:56 asdf
21:00:00:12:34:34:78 asd3
21:00:00:12:34:34:23 asdf
21:00:00:12:34:34:45 asdf
21:00:00:12:34:34:89 asdf

sed 's/^ //' file

[root@dist unix]# cat file
abcd
cdef
opqr
[root@dist unix]# bash dele.sh 1 3
bd
df
pr
[root@dist unix]# bash dele.sh 2 4
ac
ce
oq
[root@dist unix]# cat dele.sh
#!/bin/bash
while read i...

[root@dist unix]# cat a.sh
#!/bin/bash
n=0
for i in {1..9};do
n=${i}" "${n}
echo ${n}
done
[root@dist unix]# bash a.sh
1 0
2 1 0
3 2 1 0
4 3 2 1 0
5 4 3 2 1 0
6 5 4 3 2 1 0
7...

#!/bin/bash
while read i
do
wget ${i}

done < <(grep -oP '(?<=>)\w.*(?=</)' urlfile)

sed 'N;s/\n/,/' file

thanks Scrutinizer , good reasoning.

#!/bin/bash
while read i
do
mkdir $(echo ${i:6:2}) && mv $i $(echo ${i:6:2})
done < <(ls |awk --posix '$0~/[A-Z]{2}.txt$/')

I have two files.

file 1 content is
jerry 123
tom 456
shrek 789

file 2 contents is
a@hotmail.com
b@hotmail.com
c@hotmail.com
d@hotmail.com
e@hotmail.com
f@hotmail.com

Now, i want...

#!/bin/bash
a=0
while read line;
do
array[${a}]="${line}"
((a++))
done <file

echo ${array[0]}
echo ${array[1]}
echo ${array[2]}

b=are
[[ $b =~ ^b ]] && echo match

huaihaizi good reasoning