例子 3-1. 代码块和I/O重定向
1 #!/bin/bash
2 # 从/etc/fstab中读行.
3
4 File=/etc/fstab
5
6 {
7 read line1
8 read line2
9 } < $File
10
11 echo "First line in $File is:"
12 echo "$line1"
13 echo
14 echo "Second line in $File is:"
15 echo "$line2"
16
17 exit 0
18
19 # 现在, 你怎么分析每行的分割域?
20 # 小提示: 使用awk.
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rpm文件安装检测
#!/bin/bash
# rpm-check.sh
# Queries an rpm file for description, listing,
#+ and whether it can be installed.
# Saves output to a file.
#
# This script illustrates using a code block.
SUCCESS=0
E_NOARGS=65
if [ -z "$1" ]
then
echo "Usage: `basename $0` rpm-file"
exit $E_NOARGS
fi
{ # Begin code block.
echo
echo "Archive Description:"
rpm -qpi $1 # Query description.
echo
echo "Archive Listing:"
rpm -qpl $1 # Query listing.
echo
rpm -i --test $1 # Query whether rpm file can be installed.
if [ "$?" -eq $SUCCESS ]
then
echo "$1 can be installed."
else
echo "$1 cannot be installed."
fi
echo # End code block.
} > "$1.test" # Redirects output of everything in block to file.
echo "Results of rpm test in file $1.test"
# See rpm man page for explanation of options.
exit 0
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